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* 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/facility.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;
if (!PAGE_DEFAULT_KEY)
return;
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;
}
}
#ifdef CONFIG_PROC_FS
atomic_long_t direct_pages_count[PG_DIRECT_MAP_MAX];
void arch_report_meminfo(struct seq_file *m)
{
seq_printf(m, "DirectMap4k: %8lu kB\n",
atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_4K]) << 2);
seq_printf(m, "DirectMap1M: %8lu kB\n",
atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_1M]) << 10);
seq_printf(m, "DirectMap2G: %8lu kB\n",
atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_2G]) << 21);
}
#endif /* CONFIG_PROC_FS */
static void pgt_set(unsigned long *old, unsigned long new, unsigned long addr,
unsigned long dtt)
{
unsigned long table, mask;
mask = 0;
if (MACHINE_HAS_EDAT2) {
switch (dtt) {
case CRDTE_DTT_REGION3:
mask = ~(PTRS_PER_PUD * sizeof(pud_t) - 1);
break;
case CRDTE_DTT_SEGMENT:
mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
break;
case CRDTE_DTT_PAGE:
mask = ~(PTRS_PER_PTE * sizeof(pte_t) - 1);
break;
}
table = (unsigned long)old & mask;
crdte(*old, new, table, dtt, addr, S390_lowcore.kernel_asce);
} else if (MACHINE_HAS_IDTE) {
cspg(old, *old, new);
} else {
csp((unsigned int *)old + 1, *old, new);
}
}
struct cpa {
unsigned int set_ro : 1;
unsigned int clear_ro : 1;
};
static int walk_pte_level(pmd_t *pmdp, unsigned long addr, unsigned long end,
struct cpa cpa)
{
pte_t *ptep, new;
ptep = pte_offset(pmdp, addr);
do {
if (pte_none(*ptep))
return -EINVAL;
if (cpa.set_ro)
new = pte_wrprotect(*ptep);
else if (cpa.clear_ro)
new = pte_mkwrite(pte_mkdirty(*ptep));
pgt_set((unsigned long *)ptep, pte_val(new), addr, CRDTE_DTT_PAGE);
ptep++;
addr += PAGE_SIZE;
cond_resched();
} while (addr < end);
return 0;
}
static int split_pmd_page(pmd_t *pmdp, unsigned long addr)
{
unsigned long pte_addr, prot;
pte_t *pt_dir, *ptep;
pmd_t new;
int i, ro;
pt_dir = vmem_pte_alloc();
if (!pt_dir)
return -ENOMEM;
pte_addr = pmd_pfn(*pmdp) << PAGE_SHIFT;
ro = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_PROTECT);
prot = pgprot_val(ro ? PAGE_KERNEL_RO : PAGE_KERNEL);
ptep = pt_dir;
for (i = 0; i < PTRS_PER_PTE; i++) {
pte_val(*ptep) = pte_addr | prot;
pte_addr += PAGE_SIZE;
ptep++;
}
pmd_val(new) = __pa(pt_dir) | _SEGMENT_ENTRY;
pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
update_page_count(PG_DIRECT_MAP_4K, PTRS_PER_PTE);
update_page_count(PG_DIRECT_MAP_1M, -1);
return 0;
}
static void modify_pmd_page(pmd_t *pmdp, unsigned long addr, struct cpa cpa)
{
pmd_t new;
if (cpa.set_ro)
new = pmd_wrprotect(*pmdp);
else if (cpa.clear_ro)
new = pmd_mkwrite(pmd_mkdirty(*pmdp));
pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
}
static int walk_pmd_level(pud_t *pudp, unsigned long addr, unsigned long end,
struct cpa cpa)
{
unsigned long next;
pmd_t *pmdp;
int rc = 0;
pmdp = pmd_offset(pudp, addr);
do {
if (pmd_none(*pmdp))
return -EINVAL;
next = pmd_addr_end(addr, end);
if (pmd_large(*pmdp)) {
if (addr & ~PMD_MASK || addr + PMD_SIZE > next) {
rc = split_pmd_page(pmdp, addr);
if (rc)
return rc;
continue;
}
modify_pmd_page(pmdp, addr, cpa);
} else {
rc = walk_pte_level(pmdp, addr, next, cpa);
if (rc)
return rc;
}
pmdp++;
addr = next;
cond_resched();
} while (addr < end);
return rc;
}
static int split_pud_page(pud_t *pudp, unsigned long addr)
{
unsigned long pmd_addr, prot;
pmd_t *pm_dir, *pmdp;
pud_t new;
int i, ro;
pm_dir = vmem_pmd_alloc();
if (!pm_dir)
return -ENOMEM;
pmd_addr = pud_pfn(*pudp) << PAGE_SHIFT;
ro = !!(pud_val(*pudp) & _REGION_ENTRY_PROTECT);
prot = pgprot_val(ro ? SEGMENT_KERNEL_RO : SEGMENT_KERNEL);
pmdp = pm_dir;
for (i = 0; i < PTRS_PER_PMD; i++) {
pmd_val(*pmdp) = pmd_addr | prot;
pmd_addr += PMD_SIZE;
pmdp++;
}
pud_val(new) = __pa(pm_dir) | _REGION3_ENTRY;
pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
update_page_count(PG_DIRECT_MAP_1M, PTRS_PER_PMD);
update_page_count(PG_DIRECT_MAP_2G, -1);
return 0;
}
static void modify_pud_page(pud_t *pudp, unsigned long addr, struct cpa cpa)
{
pud_t new;
if (cpa.set_ro)
new = pud_wrprotect(*pudp);
else if (cpa.clear_ro)
new = pud_mkwrite(pud_mkdirty(*pudp));
pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
}
static int walk_pud_level(pgd_t *pgd, unsigned long addr, unsigned long end,
struct cpa cpa)
{
unsigned long next;
pud_t *pudp;
int rc = 0;
pudp = pud_offset(pgd, addr);
do {
if (pud_none(*pudp))
return -EINVAL;
next = pud_addr_end(addr, end);
if (pud_large(*pudp)) {
if (addr & ~PUD_MASK || addr + PUD_SIZE > next) {
rc = split_pud_page(pudp, addr);
if (rc)
break;
continue;
}
modify_pud_page(pudp, addr, cpa);
} else {
rc = walk_pmd_level(pudp, addr, next, cpa);
}
pudp++;
addr = next;
cond_resched();
} while (addr < end && !rc);
return rc;
}
static DEFINE_MUTEX(cpa_mutex);
static int change_page_attr(unsigned long addr, unsigned long end,
struct cpa cpa)
{
unsigned long next;
int rc = -EINVAL;
pgd_t *pgdp;
if (addr == end)
return 0;
if (end >= MODULES_END)
return -EINVAL;
mutex_lock(&cpa_mutex);
pgdp = pgd_offset_k(addr);
do {
if (pgd_none(*pgdp))
break;
next = pgd_addr_end(addr, end);
rc = walk_pud_level(pgdp, addr, next, cpa);
if (rc)
break;
cond_resched();
} while (pgdp++, addr = next, addr < end && !rc);
mutex_unlock(&cpa_mutex);
return rc;
}
int set_memory_ro(unsigned long addr, int numpages)
{
struct cpa cpa = {
.set_ro = 1,
};
addr &= PAGE_MASK;
return change_page_attr(addr, addr + numpages * PAGE_SIZE, cpa);
}
int set_memory_rw(unsigned long addr, int numpages)
{
struct cpa cpa = {
.clear_ro = 1,
};
addr &= PAGE_MASK;
return change_page_attr(addr, addr + numpages * PAGE_SIZE, cpa);
}
/* 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
static void ipte_range(pte_t *pte, unsigned long address, int nr)
{
int i;
if (test_facility(13)) {
__ptep_ipte_range(address, nr - 1, pte);
return;
}
for (i = 0; i < nr; i++) {
__ptep_ipte(address, pte);
address += PAGE_SIZE;
pte++;
}
}
void __kernel_map_pages(struct page *page, int numpages, int enable)
{
unsigned long address;
int nr, i, j;
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
for (i = 0; i < numpages;) {
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);
nr = (unsigned long)pte >> ilog2(sizeof(long));
nr = PTRS_PER_PTE - (nr & (PTRS_PER_PTE - 1));
nr = min(numpages - i, nr);
if (enable) {
for (j = 0; j < nr; j++) {
pte_val(*pte) = address | pgprot_val(PAGE_KERNEL);
address += PAGE_SIZE;
pte++;
}
} else {
ipte_range(pte, address, nr);
}
i += nr;
}
}
#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 */
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