mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 08:39:59 +07:00
45e576b1c3
Use the existing arch_alloc_page/arch_free_page callbacks to do the guest page state transitions between stable and unused. Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
80 lines
1.5 KiB
C
80 lines
1.5 KiB
C
/*
|
|
* arch/s390/mm/page-states.c
|
|
*
|
|
* Copyright IBM Corp. 2008
|
|
*
|
|
* Guest page hinting for unused pages.
|
|
*
|
|
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/types.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/init.h>
|
|
|
|
#define ESSA_SET_STABLE 1
|
|
#define ESSA_SET_UNUSED 2
|
|
|
|
static int cmma_flag;
|
|
|
|
static int __init cmma(char *str)
|
|
{
|
|
char *parm;
|
|
parm = strstrip(str);
|
|
if (strcmp(parm, "yes") == 0 || strcmp(parm, "on") == 0) {
|
|
cmma_flag = 1;
|
|
return 1;
|
|
}
|
|
cmma_flag = 0;
|
|
if (strcmp(parm, "no") == 0 || strcmp(parm, "off") == 0)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
__setup("cmma=", cmma);
|
|
|
|
void __init cmma_init(void)
|
|
{
|
|
register unsigned long tmp asm("0") = 0;
|
|
register int rc asm("1") = -EOPNOTSUPP;
|
|
|
|
if (!cmma_flag)
|
|
return;
|
|
asm volatile(
|
|
" .insn rrf,0xb9ab0000,%1,%1,0,0\n"
|
|
"0: la %0,0\n"
|
|
"1:\n"
|
|
EX_TABLE(0b,1b)
|
|
: "+&d" (rc), "+&d" (tmp));
|
|
if (rc)
|
|
cmma_flag = 0;
|
|
}
|
|
|
|
void arch_free_page(struct page *page, int order)
|
|
{
|
|
int i, rc;
|
|
|
|
if (!cmma_flag)
|
|
return;
|
|
for (i = 0; i < (1 << order); i++)
|
|
asm volatile(".insn rrf,0xb9ab0000,%0,%1,%2,0"
|
|
: "=&d" (rc)
|
|
: "a" ((page_to_pfn(page) + i) << PAGE_SHIFT),
|
|
"i" (ESSA_SET_UNUSED));
|
|
}
|
|
|
|
void arch_alloc_page(struct page *page, int order)
|
|
{
|
|
int i, rc;
|
|
|
|
if (!cmma_flag)
|
|
return;
|
|
for (i = 0; i < (1 << order); i++)
|
|
asm volatile(".insn rrf,0xb9ab0000,%0,%1,%2,0"
|
|
: "=&d" (rc)
|
|
: "a" ((page_to_pfn(page) + i) << PAGE_SHIFT),
|
|
"i" (ESSA_SET_STABLE));
|
|
}
|