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mips: add support for folded p4d page tables 

Implement primitives necessary for the 4th level folding, add walks of p4d
level where appropriate, replace 5leve-fixup.h with pgtable-nop4d.h and
drop usage of __ARCH_USE_5LEVEL_HACK.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Paul Burton <paulburton@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org
Cc: Mike Rapoport <rppt@kernel.org>
This commit is contained in:
Mike Rapoport 2019-11-21 18:21:33 +02:00 committed by Paul Burton
parent 31168f033e
commit 2bee1b5848
No known key found for this signature in database
GPG Key ID: 3EA79FACB57500DD
14 changed files with 75 additions and 39 deletions
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2
arch/mips/include/asm/fixmap.h
View File

@ -70,7 +70,7 @@ enum fixed_addresses {
#include <asm-generic/fixmap.h>
#define kmap_get_fixmap_pte(vaddr) \
pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))
pte_offset_kernel(pmd_offset(pud_offset(p4d_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr)), (vaddr))
/*
* Called from pgtable_init()

4
arch/mips/include/asm/pgalloc.h
View File

@ -96,9 +96,9 @@ static inline void pud_free(struct mm_struct *mm, pud_t *pud)
free_pages((unsigned long)pud, PUD_ORDER);
}
static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
{
set_pgd(pgd, __pgd((unsigned long)pud));
set_p4d(p4d, __p4d((unsigned long)pud));
}
#define __pud_free_tlb(tlb, x, addr) pud_free((tlb)->mm, x)

1
arch/mips/include/asm/pgtable-32.h
View File

@ -16,7 +16,6 @@
#include <asm/cachectl.h>
#include <asm/fixmap.h>
#define __ARCH_USE_5LEVEL_HACK
#include <asm-generic/pgtable-nopmd.h>
#ifdef CONFIG_HIGHMEM

37
arch/mips/include/asm/pgtable-64.h
View File

@ -17,13 +17,12 @@
#include <asm/cachectl.h>
#include <asm/fixmap.h>
#define __ARCH_USE_5LEVEL_HACK
#if CONFIG_PGTABLE_LEVELS == 2
#include <asm-generic/pgtable-nopmd.h>
#elif CONFIG_PGTABLE_LEVELS == 3
#include <asm-generic/pgtable-nopud.h>
#else
#include <asm-generic/5level-fixup.h>
#include <asm-generic/pgtable-nop4d.h>
#endif
/*
@ -188,47 +187,49 @@ extern pud_t invalid_pud_table[PTRS_PER_PUD];
/*
* Empty pgd entries point to the invalid_pud_table.
*/
static inline int pgd_none(pgd_t pgd)
static inline int p4d_none(p4d_t p4d)
{
return pgd_val(pgd) == (unsigned long)invalid_pud_table;
return p4d_val(p4d) == (unsigned long)invalid_pud_table;
}
static inline int pgd_bad(pgd_t pgd)
static inline int p4d_bad(p4d_t p4d)
{
if (unlikely(pgd_val(pgd) & ~PAGE_MASK))
if (unlikely(p4d_val(p4d) & ~PAGE_MASK))
return 1;
return 0;
}
static inline int pgd_present(pgd_t pgd)
static inline int p4d_present(p4d_t p4d)
{
return pgd_val(pgd) != (unsigned long)invalid_pud_table;
return p4d_val(p4d) != (unsigned long)invalid_pud_table;
}
static inline void pgd_clear(pgd_t *pgdp)
static inline void p4d_clear(p4d_t *p4dp)
{
pgd_val(*pgdp) = (unsigned long)invalid_pud_table;
p4d_val(*p4dp) = (unsigned long)invalid_pud_table;
}
#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
static inline unsigned long pgd_page_vaddr(pgd_t pgd)
static inline unsigned long p4d_page_vaddr(p4d_t p4d)
{
return pgd_val(pgd);
return p4d_val(p4d);
}
#define pgd_phys(pgd) virt_to_phys((void *)pgd_val(pgd))
#define pgd_page(pgd) (pfn_to_page(pgd_phys(pgd) >> PAGE_SHIFT))
#define p4d_phys(p4d) virt_to_phys((void *)p4d_val(p4d))
#define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT))
static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
#define p4d_index(address) (((address) >> P4D_SHIFT) & (PTRS_PER_P4D - 1))
static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
{
return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
return (pud_t *)p4d_page_vaddr(*p4d) + pud_index(address);
}
static inline void set_pgd(pgd_t *pgd, pgd_t pgdval)
static inline void set_p4d(p4d_t *p4d, p4d_t p4dval)
{
*pgd = pgdval;
*p4d = p4dval;
}
#endif

16
arch/mips/kvm/mmu.c
View File

@ -136,6 +136,7 @@ pgd_t *kvm_pgd_alloc(void)
static pte_t *kvm_mips_walk_pgd(pgd_t *pgd, struct kvm_mmu_memory_cache *cache,
unsigned long addr)
{
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
@ -145,7 +146,8 @@ static pte_t *kvm_mips_walk_pgd(pgd_t *pgd, struct kvm_mmu_memory_cache *cache,
BUG();
return NULL;
}
pud = pud_offset(pgd, addr);
p4d = p4d_offset(pgd, addr);
pud = pud_offset(p4d, addr);
if (pud_none(*pud)) {
pmd_t *new_pmd;
@ -258,6 +260,7 @@ static bool kvm_mips_flush_gpa_pud(pud_t *pud, unsigned long start_gpa,
static bool kvm_mips_flush_gpa_pgd(pgd_t *pgd, unsigned long start_gpa,
unsigned long end_gpa)
{
p4d_t *p4d;
pud_t *pud;
unsigned long end = ~0ul;
int i_min = pgd_index(start_gpa);
@ -269,7 +272,8 @@ static bool kvm_mips_flush_gpa_pgd(pgd_t *pgd, unsigned long start_gpa,
if (!pgd_present(pgd[i]))
continue;
pud = pud_offset(pgd + i, 0);
p4d = p4d_offset(pgd, 0);
pud = pud_offset(p4d + i, 0);
if (i == i_max)
end = end_gpa;
@ -378,6 +382,7 @@ static int kvm_mips_##name##_pgd(pgd_t *pgd, unsigned long start, \
unsigned long end) \
{ \
int ret = 0; \
p4d_t *p4d; \
pud_t *pud; \
unsigned long cur_end = ~0ul; \
int i_min = pgd_index(start); \
@ -388,7 +393,8 @@ static int kvm_mips_##name##_pgd(pgd_t *pgd, unsigned long start, \
if (!pgd_present(pgd[i])) \
continue; \
\
pud = pud_offset(pgd + i, 0); \
p4d = p4d_offset(pgd, 0); \
pud = pud_offset(p4d + i, 0); \
if (i == i_max) \
cur_end = end; \
\
@ -916,6 +922,7 @@ static bool kvm_mips_flush_gva_pud(pud_t *pud, unsigned long start_gva,
static bool kvm_mips_flush_gva_pgd(pgd_t *pgd, unsigned long start_gva,
unsigned long end_gva)
{
p4d_t *p4d;
pud_t *pud;
unsigned long end = ~0ul;
int i_min = pgd_index(start_gva);
@ -927,7 +934,8 @@ static bool kvm_mips_flush_gva_pgd(pgd_t *pgd, unsigned long start_gva,
if (!pgd_present(pgd[i]))
continue;
pud = pud_offset(pgd + i, 0);
p4d = p4d_offset(pgd, 0);
pud = pud_offset(p4d + i, 0);
if (i == i_max)
end = end_gva;

4
arch/mips/kvm/trap_emul.c
View File

@ -564,6 +564,7 @@ static void kvm_mips_emul_free_gva_pt(pgd_t *pgd)
/* Don't free host kernel page tables copied from init_mm.pgd */
const unsigned long end = 0x80000000;
unsigned long pgd_va, pud_va, pmd_va;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
@ -576,7 +577,8 @@ static void kvm_mips_emul_free_gva_pt(pgd_t *pgd)
pgd_va = (unsigned long)i << PGDIR_SHIFT;
if (pgd_va >= end)
break;
pud = pud_offset(pgd + i, 0);
p4d = p4d_offset(pgd, 0);
pud = pud_offset(p4d + i, 0);
for (j = 0; j < PTRS_PER_PUD; j++) {
if (pud_none(pud[j]))
continue;

4
arch/mips/mm/c-r3k.c
View File

@ -241,6 +241,7 @@ static void r3k_flush_cache_page(struct vm_area_struct *vma,
int exec = vma->vm_flags & VM_EXEC;
struct mm_struct *mm = vma->vm_mm;
pgd_t *pgdp;
p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
@ -253,7 +254,8 @@ static void r3k_flush_cache_page(struct vm_area_struct *vma,
return;
pgdp = pgd_offset(mm, addr);
pudp = pud_offset(pgdp, addr);
p4dp = p4d_offset(pgdp, addr);
pudp = pud_offset(p4dp, addr);
pmdp = pmd_offset(pudp, addr);
ptep = pte_offset(pmdp, addr);

4
arch/mips/mm/c-r4k.c
View File

@ -654,6 +654,7 @@ static inline void local_r4k_flush_cache_page(void *args)
struct mm_struct *mm = vma->vm_mm;
int map_coherent = 0;
pgd_t *pgdp;
p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
@ -668,7 +669,8 @@ static inline void local_r4k_flush_cache_page(void *args)
addr &= PAGE_MASK;
pgdp = pgd_offset(mm, addr);
pudp = pud_offset(pgdp, addr);
p4dp = p4d_offset(pgdp, addr);
pudp = pud_offset(p4dp, addr);
pmdp = pmd_offset(pudp, addr);
ptep = pte_offset(pmdp, addr);

4
arch/mips/mm/c-tx39.c
View File

@ -170,6 +170,7 @@ static void tx39_flush_cache_page(struct vm_area_struct *vma, unsigned long page
int exec = vma->vm_flags & VM_EXEC;
struct mm_struct *mm = vma->vm_mm;
pgd_t *pgdp;
p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
@ -183,7 +184,8 @@ static void tx39_flush_cache_page(struct vm_area_struct *vma, unsigned long page
page &= PAGE_MASK;
pgdp = pgd_offset(mm, page);
pudp = pud_offset(pgdp, page);
p4dp = p4d_offset(pgdp, page);
pudp = pud_offset(p4dp, page);
pmdp = pmd_offset(pudp, page);
ptep = pte_offset(pmdp, page);

10
arch/mips/mm/fault.c
View File

@ -294,6 +294,7 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
*/
int offset = pgd_index(address);
pgd_t *pgd, *pgd_k;
p4d_t *p4d, *p4d_k;
pud_t *pud, *pud_k;
pmd_t *pmd, *pmd_k;
pte_t *pte_k;
@ -305,8 +306,13 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
goto no_context;
set_pgd(pgd, *pgd_k);
pud = pud_offset(pgd, address);
pud_k = pud_offset(pgd_k, address);
p4d = p4d_offset(pgd, address);
p4d_k = p4d_offset(pgd_k, address);
if (!p4d_present(*p4d_k))
goto no_context;
pud = pud_offset(p4d, address);
pud_k = pud_offset(p4d_k, address);
if (!pud_present(*pud_k))
goto no_context;

10
arch/mips/mm/hugetlbpage.c
View File

@ -25,11 +25,13 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr,
unsigned long sz)
{
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pte_t *pte = NULL;
pgd = pgd_offset(mm, addr);
pud = pud_alloc(mm, pgd, addr);
p4d = p4d_alloc(mm, pgd, addr);
pud = pud_alloc(mm, p4d, addr);
if (pud)
pte = (pte_t *)pmd_alloc(mm, pud, addr);
@ -40,15 +42,19 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
unsigned long sz)
{
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd = NULL;
pgd = pgd_offset(mm, addr);
if (pgd_present(*pgd)) {
pud = pud_offset(pgd, addr);
p4d = p4d_offset(pgd, addr);
if (p4d_present(*p4d)) {
pud = pud_offset(p4d, addr);
if (pud_present(*pud))
pmd = pmd_offset(pud, addr);
}
}
return (pte_t *) pmd;
}

6
arch/mips/mm/ioremap.c
View File

@ -78,11 +78,15 @@ static int remap_area_pages(unsigned long address, phys_addr_t phys_addr,
flush_cache_all();
BUG_ON(address >= end);
do {
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
error = -ENOMEM;
pud = pud_alloc(&init_mm, dir, address);
p4d = p4d_alloc(&init_mm, dir, address);
if (!p4d)
break;
pud = pud_alloc(&init_mm, p4d, address);
if (!pud)
break;
pmd = pmd_alloc(&init_mm, pud, address);

4
arch/mips/mm/pgtable-32.c
View File

@ -56,6 +56,7 @@ void __init pagetable_init(void)
pgd_t *pgd_base;
#ifdef CONFIG_HIGHMEM
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
@ -82,7 +83,8 @@ void __init pagetable_init(void)
fixrange_init(vaddr & PMD_MASK, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
pgd = swapper_pg_dir + pgd_index(vaddr);
pud = pud_offset(pgd, vaddr);
p4d = p4d_offset(pgd, vaddr);
pud = pud_offset(p4d, vaddr);
pmd = pmd_offset(pud, vaddr);
pte = pte_offset_kernel(pmd, vaddr);
pkmap_page_table = pte;

4
arch/mips/mm/tlb-r4k.c
View File

@ -295,6 +295,7 @@ void __update_tlb(struct vm_area_struct * vma, unsigned long address, pte_t pte)
{
unsigned long flags;
pgd_t *pgdp;
p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
@ -320,7 +321,8 @@ void __update_tlb(struct vm_area_struct * vma, unsigned long address, pte_t pte)
mtc0_tlbw_hazard();
tlb_probe();
tlb_probe_hazard();
pudp = pud_offset(pgdp, address);
p4dp = p4d_offset(pgdp, address);
pudp = pud_offset(p4dp, address);
pmdp = pmd_offset(pudp, address);
idx = read_c0_index();
#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT