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ARM: pgtable: add pud-level code

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Add pud_offset() et.al. between the pgd and pmd code in preparation of
using pgtable-nopud.h rather than 4level-fixup.h.

This incorporates a fix from Jamie Iles <jamie@jamieiles.com> for
uaccess_with_memcpy.c.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2010-11-21 16:27:49 +00:00
parent f60892d3e3
commit 516295e5ab
9 changed files with 116 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm/include/asm/pgtable.h
View File

@ -301,6 +301,7 @@ extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
#define pgd_present(pgd) (1)
#define pgd_clear(pgdp) do { } while (0)
#define set_pgd(pgd,pgdp) do { } while (0)
#define set_pud(pud,pudp) do { } while (0)
/* Find an entry in the second-level page table.. */

7
arch/arm/lib/uaccess_with_memcpy.c
View File

@ -27,13 +27,18 @@ pin_page_for_write(const void __user *_addr, pte_t **ptep, spinlock_t **ptlp)
pgd_t *pgd;
pmd_t *pmd;
pte_t *pte;
pud_t *pud;
spinlock_t *ptl;
pgd = pgd_offset(current->mm, addr);
if (unlikely(pgd_none(*pgd) || pgd_bad(*pgd)))
return 0;
pmd = pmd_offset(pgd, addr);
pud = pud_offset(pgd, addr);
if (unlikely(pud_none(*pud) || pud_bad(*pud)))
return 0;
pmd = pmd_offset(pud, addr);
if (unlikely(pmd_none(*pmd) || pmd_bad(*pmd)))
return 0;

11
arch/arm/mm/dma-mapping.c
View File

@ -148,6 +148,7 @@ static int __init consistent_init(void)
{
int ret = 0;
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
int i = 0;
@ -155,7 +156,15 @@ static int __init consistent_init(void)
do {
pgd = pgd_offset(&init_mm, base);
pmd = pmd_alloc(&init_mm, pgd, base);
pud = pud_alloc(&init_mm, pgd, base);
if (!pud) {
printk(KERN_ERR "%s: no pud tables\n", __func__);
ret = -ENOMEM;
break;
}
pmd = pmd_alloc(&init_mm, pud, base);
if (!pmd) {
printk(KERN_ERR "%s: no pmd tables\n", __func__);
ret = -ENOMEM;

7
arch/arm/mm/fault-armv.c
View File

@ -95,6 +95,7 @@ static int adjust_pte(struct vm_area_struct *vma, unsigned long address,
{
spinlock_t *ptl;
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
int ret;
@ -103,7 +104,11 @@ static int adjust_pte(struct vm_area_struct *vma, unsigned long address,
if (pgd_none_or_clear_bad(pgd))
return 0;
pmd = pmd_offset(pgd, address);
pud = pud_offset(pgd, address);
if (pud_none_or_clear_bad(pud))
return 0;
pmd = pmd_offset(pud, address);
if (pmd_none_or_clear_bad(pmd))
return 0;

29
arch/arm/mm/fault.c
View File

@ -80,6 +80,7 @@ void show_pte(struct mm_struct *mm, unsigned long addr)
addr, (long long)pgd_val(*pgd));
do {
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
@ -91,7 +92,19 @@ void show_pte(struct mm_struct *mm, unsigned long addr)
break;
}
pmd = pmd_offset(pgd, addr);
pud = pud_offset(pgd, addr);
if (PTRS_PER_PUD != 1)
printk(", *pud=%08lx", pud_val(*pud));
if (pud_none(*pud))
break;
if (pud_bad(*pud)) {
printk("(bad)");
break;
}
pmd = pmd_offset(pud, addr);
if (PTRS_PER_PMD != 1)
printk(", *pmd=%08llx", (long long)pmd_val(*pmd));
@ -390,6 +403,7 @@ do_translation_fault(unsigned long addr, unsigned int fsr,
{
unsigned int index;
pgd_t *pgd, *pgd_k;
pud_t *pud, *pud_k;
pmd_t *pmd, *pmd_k;
if (addr < TASK_SIZE)
@ -408,12 +422,19 @@ do_translation_fault(unsigned long addr, unsigned int fsr,
if (pgd_none(*pgd_k))
goto bad_area;
if (!pgd_present(*pgd))
set_pgd(pgd, *pgd_k);
pmd_k = pmd_offset(pgd_k, addr);
pmd = pmd_offset(pgd, addr);
pud = pud_offset(pgd, addr);
pud_k = pud_offset(pgd_k, addr);
if (pud_none(*pud_k))
goto bad_area;
if (!pud_present(*pud))
set_pud(pud, *pud_k);
pmd = pmd_offset(pud, addr);
pmd_k = pmd_offset(pud_k, addr);
/*
* On ARM one Linux PGD entry contains two hardware entries (see page

35
arch/arm/mm/idmap.c
View File

@ -4,10 +4,10 @@
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
static void idmap_add_pmd(pgd_t *pgd, unsigned long addr, unsigned long end,
static void idmap_add_pmd(pud_t *pud, unsigned long addr, unsigned long end,
unsigned long prot)
{
pmd_t *pmd = pmd_offset(pgd, addr);
pmd_t *pmd = pmd_offset(pud, addr);
addr = (addr & PMD_MASK) | prot;
pmd[0] = __pmd(addr);
@ -16,6 +16,18 @@ static void idmap_add_pmd(pgd_t *pgd, unsigned long addr, unsigned long end,
flush_pmd_entry(pmd);
}
static void idmap_add_pud(pgd_t *pgd, unsigned long addr, unsigned long end,
unsigned long prot)
{
pud_t *pud = pud_offset(pgd, addr);
unsigned long next;
do {
next = pud_addr_end(addr, end);
idmap_add_pmd(pud, addr, next, prot);
} while (pud++, addr = next, addr != end);
}
void identity_mapping_add(pgd_t *pgd, unsigned long addr, unsigned long end)
{
unsigned long prot, next;
@ -27,17 +39,28 @@ void identity_mapping_add(pgd_t *pgd, unsigned long addr, unsigned long end)
pgd += pgd_index(addr);
do {
next = pgd_addr_end(addr, end);
idmap_add_pmd(pgd, addr, next, prot);
idmap_add_pud(pgd, addr, next, prot);
} while (pgd++, addr = next, addr != end);
}
#ifdef CONFIG_SMP
static void idmap_del_pmd(pgd_t *pgd, unsigned long addr, unsigned long end)
static void idmap_del_pmd(pud_t *pud, unsigned long addr, unsigned long end)
{
pmd_t *pmd = pmd_offset(pgd, addr);
pmd_t *pmd = pmd_offset(pud, addr);
pmd_clear(pmd);
}
static void idmap_del_pud(pgd_t *pgd, unsigned long addr, unsigned long end)
{
pud_t *pud = pud_offset(pgd, addr);
unsigned long next;
do {
next = pud_addr_end(addr, end);
idmap_del_pmd(pud, addr, next);
} while (pud++, addr = next, addr != end);
}
void identity_mapping_del(pgd_t *pgd, unsigned long addr, unsigned long end)
{
unsigned long next;
@ -45,7 +68,7 @@ void identity_mapping_del(pgd_t *pgd, unsigned long addr, unsigned long end)
pgd += pgd_index(addr);
do {
next = pgd_addr_end(addr, end);
idmap_del_pmd(pgd, addr, next);
idmap_del_pud(pgd, addr, next);
} while (pgd++, addr = next, addr != end);
}
#endif

2
arch/arm/mm/mm.h
View File

@ -7,7 +7,7 @@ extern pmd_t *top_pmd;
static inline pmd_t *pmd_off(pgd_t *pgd, unsigned long virt)
{
return pmd_offset(pgd, virt);
return pmd_offset(pud_offset(pgd, virt), virt);
}
static inline pmd_t *pmd_off_k(unsigned long virt)

22
arch/arm/mm/mmu.c
View File

@ -550,11 +550,11 @@ static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr,
} while (pte++, addr += PAGE_SIZE, addr != end);
}
static void __init alloc_init_section(pgd_t *pgd, unsigned long addr,
static void __init alloc_init_section(pud_t *pud, unsigned long addr,
unsigned long end, phys_addr_t phys,
const struct mem_type *type)
{
pmd_t *pmd = pmd_offset(pgd, addr);
pmd_t *pmd = pmd_offset(pud, addr);
/*
* Try a section mapping - end, addr and phys must all be aligned
@ -583,6 +583,19 @@ static void __init alloc_init_section(pgd_t *pgd, unsigned long addr,
}
}
static void alloc_init_pud(pgd_t *pgd, unsigned long addr, unsigned long end,
unsigned long phys, const struct mem_type *type)
{
pud_t *pud = pud_offset(pgd, addr);
unsigned long next;
do {
next = pud_addr_end(addr, end);
alloc_init_section(pud, addr, next, phys, type);
phys += next - addr;
} while (pud++, addr = next, addr != end);
}
static void __init create_36bit_mapping(struct map_desc *md,
const struct mem_type *type)
{
@ -630,7 +643,8 @@ static void __init create_36bit_mapping(struct map_desc *md,
pgd = pgd_offset_k(addr);
end = addr + length;
do {
pmd_t *pmd = pmd_offset(pgd, addr);
pud_t *pud = pud_offset(pgd, addr);
pmd_t *pmd = pmd_offset(pud, addr);
int i;
for (i = 0; i < 16; i++)
@ -696,7 +710,7 @@ static void __init create_mapping(struct map_desc *md)
do {
unsigned long next = pgd_addr_end(addr, end);
alloc_init_section(pgd, addr, next, phys, type);
alloc_init_pud(pgd, addr, next, phys, type);
phys += next - addr;
addr = next;

24
arch/arm/mm/pgd.c
View File

@ -23,6 +23,7 @@
pgd_t *pgd_alloc(struct mm_struct *mm)
{
pgd_t *new_pgd, *init_pgd;
pud_t *new_pud, *init_pud;
pmd_t *new_pmd, *init_pmd;
pte_t *new_pte, *init_pte;
@ -46,7 +47,11 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
* On ARM, first page must always be allocated since it
* contains the machine vectors.
*/
new_pmd = pmd_alloc(mm, new_pgd, 0);
new_pud = pud_alloc(mm, new_pgd, 0);
if (!new_pud)
goto no_pud;
new_pmd = pmd_alloc(mm, new_pud, 0);
if (!new_pmd)
goto no_pmd;
@ -54,7 +59,8 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
if (!new_pte)
goto no_pte;
init_pmd = pmd_offset(init_pgd, 0);
init_pud = pud_offset(init_pgd, 0);
init_pmd = pmd_offset(init_pud, 0);
init_pte = pte_offset_map(init_pmd, 0);
set_pte_ext(new_pte, *init_pte, 0);
pte_unmap(init_pte);
@ -66,6 +72,8 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
no_pte:
pmd_free(mm, new_pmd);
no_pmd:
pud_free(mm, new_pud);
no_pud:
free_pages((unsigned long)new_pgd, 2);
no_pgd:
return NULL;
@ -74,6 +82,7 @@ no_pgd:
void pgd_free(struct mm_struct *mm, pgd_t *pgd_base)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pgtable_t pte;
@ -84,7 +93,11 @@ void pgd_free(struct mm_struct *mm, pgd_t *pgd_base)
if (pgd_none_or_clear_bad(pgd))
goto no_pgd;
pmd = pmd_offset(pgd, 0);
pud = pud_offset(pgd, 0);
if (pud_none_or_clear_bad(pud))
goto no_pud;
pmd = pmd_offset(pud, 0);
if (pmd_none_or_clear_bad(pmd))
goto no_pmd;
@ -92,8 +105,11 @@ void pgd_free(struct mm_struct *mm, pgd_t *pgd_base)
pmd_clear(pmd);
pte_free(mm, pte);
no_pmd:
pgd_clear(pgd);
pud_clear(pud);
pmd_free(mm, pmd);
no_pud:
pgd_clear(pgd);
pud_free(mm, pud);
no_pgd:
free_pages((unsigned long) pgd_base, 2);
}