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s390/als: print machine type on facility mismatch

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If we have a facility mismatch the kernel only emits a warning that
the processor is not recent enough and stops operating. This doesn't
give us a lot of an idea of what actually went wrong.

As a first step print the machine type in addition.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Sascha Silbe <silbe@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2016-06-28 14:40:07 +02:00 committed by Martin Schwidefsky
parent be2412c247
commit 06ed5512a2
1 changed files with 34 additions and 4 deletions
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38
arch/s390/kernel/als.c
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@ -19,6 +19,38 @@
static unsigned long als[] __initdata = { FACILITIES_ALS };
static void __init u16_to_hex(char *str, u16 val)
{
int i, num;
for (i = 1; i <= 4; i++) {
num = (val >> (16 - 4 * i)) & 0xf;
if (num >= 10)
num += 7;
*str++ = '0' + num;
}
*str = '\0';
}
static void __init print_machine_type(void)
{
static char mach_str[80] __initdata = "Detected machine-type number: ";
char type_str[5];
struct cpuid id;
get_cpu_id(&id);
u16_to_hex(type_str, id.machine);
strcat(mach_str, type_str);
_sclp_print_early(mach_str);
}
static void __init facility_mismatch(void)
{
_sclp_print_early("The Linux kernel requires more recent processor hardware");
print_machine_type();
disabled_wait(0x8badcccc);
}
void __init verify_facilities(void)
{
int i;
@ -38,9 +70,7 @@ void __init verify_facilities(void)
: "memory", "cc");
}
for (i = 0; i < ARRAY_SIZE(als); i++) {
if ((S390_lowcore.stfle_fac_list[i] & als[i]) == als[i])
continue;
_sclp_print_early("The Linux kernel requires more recent processor hardware");
disabled_wait(0x8badcccc);
if ((S390_lowcore.stfle_fac_list[i] & als[i]) != als[i])
facility_mismatch();
}
}