mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-23 09:56:00 +00:00
f7f8d7e51d
Use sske with multiple block control to initialize storage keys within a 1 MB frame at once. It turned out that the sske with mb=1 is an order of magnitude faster than pfmf. This is only an issue for very large systems (several 100GB) where storage key initialization could last more than a minute. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
145 lines
2.9 KiB
C
145 lines
2.9 KiB
C
/*
|
|
* Copyright IBM Corp. 2011
|
|
* Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
|
|
*/
|
|
#include <linux/hugetlb.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mm.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/page.h>
|
|
|
|
static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
|
|
{
|
|
asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],9,0"
|
|
: [addr] "+a" (addr) : [skey] "d" (skey));
|
|
return addr;
|
|
}
|
|
|
|
void storage_key_init_range(unsigned long start, unsigned long end)
|
|
{
|
|
unsigned long boundary, size;
|
|
|
|
while (start < end) {
|
|
if (MACHINE_HAS_EDAT1) {
|
|
/* set storage keys for a 1MB frame */
|
|
size = 1UL << 20;
|
|
boundary = (start + size) & ~(size - 1);
|
|
if (boundary <= end) {
|
|
do {
|
|
start = sske_frame(start, PAGE_DEFAULT_KEY);
|
|
} while (start < boundary);
|
|
continue;
|
|
}
|
|
}
|
|
page_set_storage_key(start, PAGE_DEFAULT_KEY, 0);
|
|
start += PAGE_SIZE;
|
|
}
|
|
}
|
|
|
|
static pte_t *walk_page_table(unsigned long addr)
|
|
{
|
|
pgd_t *pgdp;
|
|
pud_t *pudp;
|
|
pmd_t *pmdp;
|
|
pte_t *ptep;
|
|
|
|
pgdp = pgd_offset_k(addr);
|
|
if (pgd_none(*pgdp))
|
|
return NULL;
|
|
pudp = pud_offset(pgdp, addr);
|
|
if (pud_none(*pudp) || pud_large(*pudp))
|
|
return NULL;
|
|
pmdp = pmd_offset(pudp, addr);
|
|
if (pmd_none(*pmdp) || pmd_large(*pmdp))
|
|
return NULL;
|
|
ptep = pte_offset_kernel(pmdp, addr);
|
|
if (pte_none(*ptep))
|
|
return NULL;
|
|
return ptep;
|
|
}
|
|
|
|
static void change_page_attr(unsigned long addr, int numpages,
|
|
pte_t (*set) (pte_t))
|
|
{
|
|
pte_t *ptep, pte;
|
|
int i;
|
|
|
|
for (i = 0; i < numpages; i++) {
|
|
ptep = walk_page_table(addr);
|
|
if (WARN_ON_ONCE(!ptep))
|
|
break;
|
|
pte = *ptep;
|
|
pte = set(pte);
|
|
__ptep_ipte(addr, ptep);
|
|
*ptep = pte;
|
|
addr += PAGE_SIZE;
|
|
}
|
|
}
|
|
|
|
int set_memory_ro(unsigned long addr, int numpages)
|
|
{
|
|
change_page_attr(addr, numpages, pte_wrprotect);
|
|
return 0;
|
|
}
|
|
|
|
int set_memory_rw(unsigned long addr, int numpages)
|
|
{
|
|
change_page_attr(addr, numpages, pte_mkwrite);
|
|
return 0;
|
|
}
|
|
|
|
/* not possible */
|
|
int set_memory_nx(unsigned long addr, int numpages)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int set_memory_x(unsigned long addr, int numpages)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_PAGEALLOC
|
|
void kernel_map_pages(struct page *page, int numpages, int enable)
|
|
{
|
|
unsigned long address;
|
|
pgd_t *pgd;
|
|
pud_t *pud;
|
|
pmd_t *pmd;
|
|
pte_t *pte;
|
|
int i;
|
|
|
|
for (i = 0; i < numpages; i++) {
|
|
address = page_to_phys(page + i);
|
|
pgd = pgd_offset_k(address);
|
|
pud = pud_offset(pgd, address);
|
|
pmd = pmd_offset(pud, address);
|
|
pte = pte_offset_kernel(pmd, address);
|
|
if (!enable) {
|
|
__ptep_ipte(address, pte);
|
|
pte_val(*pte) = _PAGE_TYPE_EMPTY;
|
|
continue;
|
|
}
|
|
pte_val(*pte) = __pa(address);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_HIBERNATION
|
|
bool kernel_page_present(struct page *page)
|
|
{
|
|
unsigned long addr;
|
|
int cc;
|
|
|
|
addr = page_to_phys(page);
|
|
asm volatile(
|
|
" lra %1,0(%1)\n"
|
|
" ipm %0\n"
|
|
" srl %0,28"
|
|
: "=d" (cc), "+a" (addr) : : "cc");
|
|
return cc == 0;
|
|
}
|
|
#endif /* CONFIG_HIBERNATION */
|
|
|
|
#endif /* CONFIG_DEBUG_PAGEALLOC */
|