mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 08:44:21 +08:00
2d42f94773
Add PGSTE manipulation functions: * set_pgste_bits sets specific bits in a PGSTE * get_pgste returns the whole PGSTE * pgste_perform_essa manipulates a PGSTE to set specific storage states * ESSA_[SG]ET_* macros used to indicate the action for manipulate_pgste Signed-off-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com> Reviewed-by: Janosch Frank <frankja@de.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
119 lines
2.3 KiB
C
119 lines
2.3 KiB
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/gfp.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/page-states.h>
|
|
|
|
static int cmma_flag = 1;
|
|
|
|
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);
|
|
|
|
static inline int cmma_test_essa(void)
|
|
{
|
|
register unsigned long tmp asm("0") = 0;
|
|
register int rc asm("1") = -EOPNOTSUPP;
|
|
|
|
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));
|
|
return rc;
|
|
}
|
|
|
|
void __init cmma_init(void)
|
|
{
|
|
if (!cmma_flag)
|
|
return;
|
|
if (cmma_test_essa())
|
|
cmma_flag = 0;
|
|
}
|
|
|
|
static inline void set_page_unstable(struct page *page, int order)
|
|
{
|
|
int i, rc;
|
|
|
|
for (i = 0; i < (1 << order); i++)
|
|
asm volatile(".insn rrf,0xb9ab0000,%0,%1,%2,0"
|
|
: "=&d" (rc)
|
|
: "a" (page_to_phys(page + i)),
|
|
"i" (ESSA_SET_UNUSED));
|
|
}
|
|
|
|
void arch_free_page(struct page *page, int order)
|
|
{
|
|
if (!cmma_flag)
|
|
return;
|
|
set_page_unstable(page, order);
|
|
}
|
|
|
|
static inline void set_page_stable(struct page *page, int order)
|
|
{
|
|
int i, rc;
|
|
|
|
for (i = 0; i < (1 << order); i++)
|
|
asm volatile(".insn rrf,0xb9ab0000,%0,%1,%2,0"
|
|
: "=&d" (rc)
|
|
: "a" (page_to_phys(page + i)),
|
|
"i" (ESSA_SET_STABLE));
|
|
}
|
|
|
|
void arch_alloc_page(struct page *page, int order)
|
|
{
|
|
if (!cmma_flag)
|
|
return;
|
|
set_page_stable(page, order);
|
|
}
|
|
|
|
void arch_set_page_states(int make_stable)
|
|
{
|
|
unsigned long flags, order, t;
|
|
struct list_head *l;
|
|
struct page *page;
|
|
struct zone *zone;
|
|
|
|
if (!cmma_flag)
|
|
return;
|
|
if (make_stable)
|
|
drain_local_pages(NULL);
|
|
for_each_populated_zone(zone) {
|
|
spin_lock_irqsave(&zone->lock, flags);
|
|
for_each_migratetype_order(order, t) {
|
|
list_for_each(l, &zone->free_area[order].free_list[t]) {
|
|
page = list_entry(l, struct page, lru);
|
|
if (make_stable)
|
|
set_page_stable(page, order);
|
|
else
|
|
set_page_unstable(page, order);
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&zone->lock, flags);
|
|
}
|
|
}
|