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s390/mm: implement 5 level pages tables

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Add the logic to upgrade the page table for a 64-bit process to
five levels. This increases the TASK_SIZE from 8PB to 16EB-4K.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2017-04-24 18:19:10 +02:00
parent 16ddcc34b8
commit 1aea9b3f92
15 changed files with 289 additions and 72 deletions
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44
arch/s390/mm/vmem.c
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@@ -38,6 +38,17 @@ static void __ref *vmem_alloc_pages(unsigned int order)
return (void *) memblock_alloc(size, size);
}
static inline p4d_t *vmem_p4d_alloc(void)
{
p4d_t *p4d = NULL;
p4d = vmem_alloc_pages(2);
if (!p4d)
return NULL;
clear_table((unsigned long *) p4d, _REGION2_ENTRY_EMPTY, PAGE_SIZE * 4);
return p4d;
}
static inline pud_t *vmem_pud_alloc(void)
{
pud_t *pud = NULL;
@@ -85,6 +96,7 @@ static int vmem_add_mem(unsigned long start, unsigned long size)
unsigned long end = start + size;
unsigned long address = start;
pgd_t *pg_dir;
p4d_t *p4_dir;
pud_t *pu_dir;
pmd_t *pm_dir;
pte_t *pt_dir;
@@ -102,12 +114,19 @@ static int vmem_add_mem(unsigned long start, unsigned long size)
while (address < end) {
pg_dir = pgd_offset_k(address);
if (pgd_none(*pg_dir)) {
p4_dir = vmem_p4d_alloc();
if (!p4_dir)
goto out;
pgd_populate(&init_mm, pg_dir, p4_dir);
}
p4_dir = p4d_offset(pg_dir, address);
if (p4d_none(*p4_dir)) {
pu_dir = vmem_pud_alloc();
if (!pu_dir)
goto out;
pgd_populate(&init_mm, pg_dir, pu_dir);
p4d_populate(&init_mm, p4_dir, pu_dir);
}
pu_dir = pud_offset(pg_dir, address);
pu_dir = pud_offset(p4_dir, address);
if (MACHINE_HAS_EDAT2 && pud_none(*pu_dir) && address &&
!(address & ~PUD_MASK) && (address + PUD_SIZE <= end) &&
!debug_pagealloc_enabled()) {
@@ -161,6 +180,7 @@ static void vmem_remove_range(unsigned long start, unsigned long size)
unsigned long end = start + size;
unsigned long address = start;
pgd_t *pg_dir;
p4d_t *p4_dir;
pud_t *pu_dir;
pmd_t *pm_dir;
pte_t *pt_dir;
@@ -172,7 +192,12 @@ static void vmem_remove_range(unsigned long start, unsigned long size)
address += PGDIR_SIZE;
continue;
}
pu_dir = pud_offset(pg_dir, address);
p4_dir = p4d_offset(pg_dir, address);
if (p4d_none(*p4_dir)) {
address += P4D_SIZE;
continue;
}
pu_dir = pud_offset(p4_dir, address);
if (pud_none(*pu_dir)) {
address += PUD_SIZE;
continue;
@@ -213,6 +238,7 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
unsigned long pgt_prot, sgt_prot;
unsigned long address = start;
pgd_t *pg_dir;
p4d_t *p4_dir;
pud_t *pu_dir;
pmd_t *pm_dir;
pte_t *pt_dir;
@@ -227,13 +253,21 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
for (address = start; address < end;) {
pg_dir = pgd_offset_k(address);
if (pgd_none(*pg_dir)) {
p4_dir = vmem_p4d_alloc();
if (!p4_dir)
goto out;
pgd_populate(&init_mm, pg_dir, p4_dir);
}
p4_dir = p4d_offset(pg_dir, address);
if (p4d_none(*p4_dir)) {
pu_dir = vmem_pud_alloc();
if (!pu_dir)
goto out;
pgd_populate(&init_mm, pg_dir, pu_dir);
p4d_populate(&init_mm, p4_dir, pu_dir);
}
pu_dir = pud_offset(pg_dir, address);
pu_dir = pud_offset(p4_dir, address);
if (pud_none(*pu_dir)) {
pm_dir = vmem_pmd_alloc();
if (!pm_dir)