s390/mem_detect: introduce SCLP storage info
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 <heiko.carstens@de.ibm.com>
Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/boot/mem_detect.c b/arch/s390/boot/mem_detect.c
index 920e6fe..8974e3d 100644
--- a/arch/s390/boot/mem_detect.c
+++ b/arch/s390/boot/mem_detect.c
@@ -126,6 +126,12 @@ void detect_memory(void)
unsigned long rzm;
sclp_early_get_meminfo(&max_physmem_end, &rzm);
+
+ if (!sclp_early_read_storage_info()) {
+ mem_detect.info_source = MEM_DETECT_SCLP_STOR_INFO;
+ return;
+ }
+
scan_memory(rzm);
mem_detect.info_source = MEM_DETECT_TPROT_LOOP;
if (!max_physmem_end)
diff --git a/arch/s390/include/asm/mem_detect.h b/arch/s390/include/asm/mem_detect.h
index 8586ade..00426c0 100644
--- a/arch/s390/include/asm/mem_detect.h
+++ b/arch/s390/include/asm/mem_detect.h
@@ -6,6 +6,7 @@
enum mem_info_source {
MEM_DETECT_NONE = 0,
+ MEM_DETECT_SCLP_STOR_INFO,
MEM_DETECT_TPROT_LOOP
};
@@ -32,6 +33,8 @@ struct mem_detect_info {
};
extern struct mem_detect_info mem_detect;
+void add_mem_detect_block(u64 start, u64 end);
+
static inline int __get_mem_detect_block(u32 n, unsigned long *start,
unsigned long *end)
{
diff --git a/arch/s390/include/asm/sclp.h b/arch/s390/include/asm/sclp.h
index c21a8b6..e0da13c 100644
--- a/arch/s390/include/asm/sclp.h
+++ b/arch/s390/include/asm/sclp.h
@@ -106,6 +106,7 @@ struct zpci_report_error_header {
} __packed;
int sclp_early_read_info(void);
+int sclp_early_read_storage_info(void);
int sclp_early_get_core_info(struct sclp_core_info *info);
void sclp_early_get_ipl_info(struct sclp_ipl_info *info);
void sclp_early_detect(void);
diff --git a/drivers/s390/char/sclp.h b/drivers/s390/char/sclp.h
index ffe72f0..b3fcc24 100644
--- a/drivers/s390/char/sclp.h
+++ b/drivers/s390/char/sclp.h
@@ -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)
{
diff --git a/drivers/s390/char/sclp_cmd.c b/drivers/s390/char/sclp_cmd.c
index d7686a6..37d42de 100644
--- a/drivers/s390/char/sclp_cmd.c
+++ b/drivers/s390/char/sclp_cmd.c
@@ -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) {
diff --git a/drivers/s390/char/sclp_early_core.c b/drivers/s390/char/sclp_early_core.c
index 4f04ba6..0df08dc 100644
--- a/drivers/s390/char/sclp_early_core.c
+++ b/drivers/s390/char/sclp_early_core.c
@@ -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;
+}