mirror of https://gitee.com/openkylin/linux.git
360 lines
8.4 KiB
C
360 lines
8.4 KiB
C
/*
|
|
* Copyright IBM Corp. 2011
|
|
* Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
|
|
*/
|
|
#include <linux/hugetlb.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);
|
|
}
|
|
}
|
|
|
|
static int walk_pte_level(pmd_t *pmdp, unsigned long addr, unsigned long end,
|
|
unsigned long flags)
|
|
{
|
|
pte_t *ptep, new;
|
|
|
|
ptep = pte_offset(pmdp, addr);
|
|
do {
|
|
new = *ptep;
|
|
if (pte_none(new))
|
|
return -EINVAL;
|
|
if (flags & SET_MEMORY_RO)
|
|
new = pte_wrprotect(new);
|
|
else if (flags & SET_MEMORY_RW)
|
|
new = pte_mkwrite(pte_mkdirty(new));
|
|
if ((flags & SET_MEMORY_NX) && MACHINE_HAS_NX)
|
|
pte_val(new) |= _PAGE_NOEXEC;
|
|
else if (flags & SET_MEMORY_X)
|
|
pte_val(new) &= ~_PAGE_NOEXEC;
|
|
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, nx;
|
|
|
|
pt_dir = vmem_pte_alloc();
|
|
if (!pt_dir)
|
|
return -ENOMEM;
|
|
pte_addr = pmd_pfn(*pmdp) << PAGE_SHIFT;
|
|
ro = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_PROTECT);
|
|
nx = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_NOEXEC);
|
|
prot = pgprot_val(ro ? PAGE_KERNEL_RO : PAGE_KERNEL);
|
|
if (!nx)
|
|
prot &= ~_PAGE_NOEXEC;
|
|
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,
|
|
unsigned long flags)
|
|
{
|
|
pmd_t new = *pmdp;
|
|
|
|
if (flags & SET_MEMORY_RO)
|
|
new = pmd_wrprotect(new);
|
|
else if (flags & SET_MEMORY_RW)
|
|
new = pmd_mkwrite(pmd_mkdirty(new));
|
|
if ((flags & SET_MEMORY_NX) && MACHINE_HAS_NX)
|
|
pmd_val(new) |= _SEGMENT_ENTRY_NOEXEC;
|
|
else if (flags & SET_MEMORY_X)
|
|
pmd_val(new) &= ~_SEGMENT_ENTRY_NOEXEC;
|
|
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,
|
|
unsigned long flags)
|
|
{
|
|
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, flags);
|
|
} else {
|
|
rc = walk_pte_level(pmdp, addr, next, flags);
|
|
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, nx;
|
|
|
|
pm_dir = vmem_pmd_alloc();
|
|
if (!pm_dir)
|
|
return -ENOMEM;
|
|
pmd_addr = pud_pfn(*pudp) << PAGE_SHIFT;
|
|
ro = !!(pud_val(*pudp) & _REGION_ENTRY_PROTECT);
|
|
nx = !!(pud_val(*pudp) & _REGION_ENTRY_NOEXEC);
|
|
prot = pgprot_val(ro ? SEGMENT_KERNEL_RO : SEGMENT_KERNEL);
|
|
if (!nx)
|
|
prot &= ~_SEGMENT_ENTRY_NOEXEC;
|
|
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,
|
|
unsigned long flags)
|
|
{
|
|
pud_t new = *pudp;
|
|
|
|
if (flags & SET_MEMORY_RO)
|
|
new = pud_wrprotect(new);
|
|
else if (flags & SET_MEMORY_RW)
|
|
new = pud_mkwrite(pud_mkdirty(new));
|
|
if ((flags & SET_MEMORY_NX) && MACHINE_HAS_NX)
|
|
pud_val(new) |= _REGION_ENTRY_NOEXEC;
|
|
else if (flags & SET_MEMORY_X)
|
|
pud_val(new) &= ~_REGION_ENTRY_NOEXEC;
|
|
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,
|
|
unsigned long flags)
|
|
{
|
|
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, flags);
|
|
} else {
|
|
rc = walk_pmd_level(pudp, addr, next, flags);
|
|
}
|
|
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,
|
|
unsigned long flags)
|
|
{
|
|
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, flags);
|
|
if (rc)
|
|
break;
|
|
cond_resched();
|
|
} while (pgdp++, addr = next, addr < end && !rc);
|
|
mutex_unlock(&cpa_mutex);
|
|
return rc;
|
|
}
|
|
|
|
int __set_memory(unsigned long addr, int numpages, unsigned long flags)
|
|
{
|
|
addr &= PAGE_MASK;
|
|
return change_page_attr(addr, addr + numpages * PAGE_SIZE, flags);
|
|
}
|
|
|
|
#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, IPTE_GLOBAL);
|
|
return;
|
|
}
|
|
for (i = 0; i < nr; i++) {
|
|
__ptep_ipte(address, pte, IPTE_GLOBAL);
|
|
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) &= ~_PAGE_INVALID;
|
|
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 */
|