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s390/mem_detect: introduce z/VM specific diag260 call

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In the case when z/VM memory is defined with "define storage config"
command, SCLP storage info is not available. Utilize diag260 "storage
configuration" call, to get information about z/VM specific guest memory
definitions with potential memory holes.

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>
This commit is contained in:
Vasily Gorbik 2018-04-11 18:48:20 +02:00 committed by Martin Schwidefsky
parent fddbaa5c42
commit 6e98e64329
2 changed files with 53 additions and 0 deletions
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52
arch/s390/boot/mem_detect.c
View File

@ -71,6 +71,53 @@ static unsigned long get_mem_detect_end(void)
return 0;
}
static int __diag260(unsigned long rx1, unsigned long rx2)
{
register unsigned long _rx1 asm("2") = rx1;
register unsigned long _rx2 asm("3") = rx2;
register unsigned long _ry asm("4") = 0x10; /* storage configuration */
int rc = -1; /* fail */
unsigned long reg1, reg2;
psw_t old = S390_lowcore.program_new_psw;
asm volatile(
" epsw %0,%1\n"
" st %0,%[psw_pgm]\n"
" st %1,%[psw_pgm]+4\n"
" larl %0,1f\n"
" stg %0,%[psw_pgm]+8\n"
" diag %[rx],%[ry],0x260\n"
" ipm %[rc]\n"
" srl %[rc],28\n"
"1:\n"
: "=&d" (reg1), "=&a" (reg2),
[psw_pgm] "=Q" (S390_lowcore.program_new_psw),
[rc] "+&d" (rc), [ry] "+d" (_ry)
: [rx] "d" (_rx1), "d" (_rx2)
: "cc", "memory");
S390_lowcore.program_new_psw = old;
return rc == 0 ? _ry : -1;
}
static int diag260(void)
{
int rc, i;
struct {
unsigned long start;
unsigned long end;
} storage_extents[8] __aligned(16); /* VM supports up to 8 extends */
memset(storage_extents, 0, sizeof(storage_extents));
rc = __diag260((unsigned long)storage_extents, sizeof(storage_extents));
if (rc == -1)
return -1;
for (i = 0; i < min_t(int, rc, ARRAY_SIZE(storage_extents)); i++)
add_mem_detect_block(storage_extents[i].start, storage_extents[i].end + 1);
return 0;
}
static int tprot(unsigned long addr)
{
unsigned long pgm_addr;
@ -132,6 +179,11 @@ void detect_memory(void)
return;
}
if (!diag260()) {
mem_detect.info_source = MEM_DETECT_DIAG260;
return;
}
scan_memory(rzm);
mem_detect.info_source = MEM_DETECT_TPROT_LOOP;
if (!max_physmem_end)

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

@ -7,6 +7,7 @@
enum mem_info_source {
MEM_DETECT_NONE = 0,
MEM_DETECT_SCLP_STOR_INFO,
MEM_DETECT_DIAG260,
MEM_DETECT_TPROT_LOOP
};