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s390/setup: set control program code via diag 318

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The s390x diagnose 318 instruction sets the control program name code (CPNC)
and control program version code (CPVC) to provide useful information
regarding the OS during debugging. The CPNC is explicitly set to 4 to
indicate a Linux/KVM environment.

The CPVC is a 7-byte value containing:

 - 3-byte Linux version code, currently set to 0
 - 3-byte unique value, currently set to 0
 - 1-byte trailing null

Signed-off-by: Collin Walling <walling@linux.ibm.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <1544135405-22385-2-git-send-email-walling@linux.ibm.com>
[set version code to 0 until the structure is fully defined]
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Collin Walling 2018-12-06 17:30:04 -05:00 committed by Martin Schwidefsky
parent 58661489a8
commit 4ad78b8651
6 changed files with 40 additions and 1 deletions
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12
arch/s390/include/asm/diag.h
View File

@ -32,6 +32,7 @@ enum diag_stat_enum {
DIAG_STAT_X2FC,
DIAG_STAT_X304,
DIAG_STAT_X308,
DIAG_STAT_X318,
DIAG_STAT_X500,
NR_DIAG_STAT
};
@ -293,6 +294,17 @@ struct diag26c_mac_resp {
u8 res[2];
} __aligned(8);
#define CPNC_LINUX 0x4
union diag318_info {
unsigned long val;
struct {
unsigned int cpnc : 8;
unsigned int cpvc_linux : 24;
unsigned char cpvc_distro[3];
unsigned char zero;
};
};
int diag204(unsigned long subcode, unsigned long size, void *addr);
int diag224(void *ptr);
int diag26c(void *req, void *resp, enum diag26c_sc subcode);

1
arch/s390/include/asm/sclp.h
View File

@ -78,6 +78,7 @@ struct sclp_info {
unsigned char has_skey : 1;
unsigned char has_kss : 1;
unsigned char has_gisaf : 1;
unsigned char has_diag318 : 1;
unsigned int ibc;
unsigned int mtid;
unsigned int mtid_cp;

1
arch/s390/kernel/diag.c
View File

@ -45,6 +45,7 @@ static const struct diag_desc diag_map[NR_DIAG_STAT] = {
[DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" },
[DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" },
[DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" },
[DIAG_STAT_X318] = { .code = 0x318, .name = "CP Name and Version Codes" },
[DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" },
};

21
arch/s390/kernel/setup.c
View File

@ -49,6 +49,7 @@
#include <linux/memory.h>
#include <linux/compat.h>
#include <linux/start_kernel.h>
#include <linux/version.h>
#include <asm/ipl.h>
#include <asm/facility.h>
@ -989,6 +990,25 @@ static void __init setup_task_size(void)
arch_task_struct_size = task_size;
}
/*
* Issue diagnose 318 to set the control program name and
* version codes.
*/
static void __init setup_control_program_code(void)
{
union diag318_info diag318_info = {
.cpnc = CPNC_LINUX,
.cpvc_linux = 0,
.cpvc_distro = {0},
};
if (!sclp.has_diag318)
return;
diag_stat_inc(DIAG_STAT_X318);
asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
}
/*
* Setup function called from init/main.c just after the banner
* was printed.
@ -1031,6 +1051,7 @@ void __init setup_arch(char **cmdline_p)
os_info_init();
setup_ipl();
setup_task_size();
setup_control_program_code();
/* Do some memory reservations *before* memory is added to memblock */
reserve_memory_end();

4
drivers/s390/char/sclp.h
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@ -195,7 +195,9 @@ struct read_info_sccb {
u16 hcpua; /* 120-121 */
u8 _pad_122[124 - 122]; /* 122-123 */
u32 hmfai; /* 124-127 */
u8 _pad_128[4096 - 128]; /* 128-4095 */
u8 _pad_128[134 - 128]; /* 128-133 */
u8 byte_134; /* 134 */
u8 _pad_135[4096 - 135]; /* 135-4095 */
} __packed __aligned(PAGE_SIZE);
struct read_storage_sccb {

2
drivers/s390/char/sclp_early.c
View File

@ -44,6 +44,8 @@ static void __init sclp_early_facilities_detect(struct read_info_sccb *sccb)
S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
if (sccb->fac91 & 0x40)
S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST;
if (sccb->cpuoff > 134)
sclp.has_diag318 = !!(sccb->byte_134 & 0x80);
sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
sclp.rzm <<= 20;