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linux/arch/mips/include/asm/pgtable-64.h
Mike Rapoport 974b9b2c68 mm: consolidate pte_index() and pte_offset_*() definitions 
All architectures define pte_index() as

	(address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)

and all architectures define pte_offset_kernel() as an entry in the array
of PTEs indexed by the pte_index().

For the most architectures the pte_offset_kernel() implementation relies
on the availability of pmd_page_vaddr() that converts a PMD entry value to
the virtual address of the page containing PTEs array.

Let's move x86 definitions of the PTE accessors to the generic place in
<linux/pgtable.h> and then simply drop the respective definitions from the
other architectures.

The architectures that didn't provide pmd_page_vaddr() are updated to have
that defined.

The generic implementation of pte_offset_kernel() can be overridden by an
architecture and alpha makes use of this because it has special ordering
requirements for its version of pte_offset_kernel().

[rppt@linux.ibm.com: v2]
  Link: http://lkml.kernel.org/r/20200514170327.31389-11-rppt@kernel.org
[rppt@linux.ibm.com: update]
  Link: http://lkml.kernel.org/r/20200514170327.31389-12-rppt@kernel.org
[rppt@linux.ibm.com: update]
  Link: http://lkml.kernel.org/r/20200514170327.31389-13-rppt@kernel.org
[akpm@linux-foundation.org: fix x86 warning]
[sfr@canb.auug.org.au: fix powerpc build]
  Link: http://lkml.kernel.org/r/20200607153443.GB738695@linux.ibm.com

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Cain <bcain@codeaurora.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: Guo Ren <guoren@kernel.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Mark Salter <msalter@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Nick Hu <nickhu@andestech.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vincent Chen <deanbo422@gmail.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Link: http://lkml.kernel.org/r/20200514170327.31389-10-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-06-09 09:39:14 -07:00

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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle
* Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
*/
#ifndef _ASM_PGTABLE_64_H
#define _ASM_PGTABLE_64_H
#include <linux/compiler.h>
#include <linux/linkage.h>
#include <asm/addrspace.h>
#include <asm/page.h>
#include <asm/cachectl.h>
#include <asm/fixmap.h>
#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/pgtable-nop4d.h>
#endif
/*
* Each address space has 2 4K pages as its page directory, giving 1024
* (== PTRS_PER_PGD) 8 byte pointers to pmd tables. Each pmd table is a
* single 4K page, giving 512 (== PTRS_PER_PMD) 8 byte pointers to page
* tables. Each page table is also a single 4K page, giving 512 (==
* PTRS_PER_PTE) 8 byte ptes. Each pud entry is initialized to point to
* invalid_pmd_table, each pmd entry is initialized to point to
* invalid_pte_table, each pte is initialized to 0.
*
* Kernel mappings: kernel mappings are held in the swapper_pg_table.
* The layout is identical to userspace except it's indexed with the
* fault address - VMALLOC_START.
*/
/* PGDIR_SHIFT determines what a third-level page table entry can map */
#ifdef __PAGETABLE_PMD_FOLDED
#define PGDIR_SHIFT (PAGE_SHIFT + PAGE_SHIFT + PTE_ORDER - 3)
#else
/* PMD_SHIFT determines the size of the area a second-level page table can map */
#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT + PTE_ORDER - 3))
#define PMD_SIZE (1UL << PMD_SHIFT)
#define PMD_MASK (~(PMD_SIZE-1))
# ifdef __PAGETABLE_PUD_FOLDED
# define PGDIR_SHIFT (PMD_SHIFT + (PAGE_SHIFT + PMD_ORDER - 3))
# endif
#endif
#ifndef __PAGETABLE_PUD_FOLDED
#define PUD_SHIFT (PMD_SHIFT + (PAGE_SHIFT + PMD_ORDER - 3))
#define PUD_SIZE (1UL << PUD_SHIFT)
#define PUD_MASK (~(PUD_SIZE-1))
#define PGDIR_SHIFT (PUD_SHIFT + (PAGE_SHIFT + PUD_ORDER - 3))
#endif
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE-1))
/*
* For 4kB page size we use a 3 level page tree and an 8kB pud, which
* permits us mapping 40 bits of virtual address space.
*
* We used to implement 41 bits by having an order 1 pmd level but that seemed
* rather pointless.
*
* For 8kB page size we use a 3 level page tree which permits a total of
* 8TB of address space. Alternatively a 33-bit / 8GB organization using
* two levels would be easy to implement.
*
* For 16kB page size we use a 2 level page tree which permits a total of
* 36 bits of virtual address space. We could add a third level but it seems
* like at the moment there's no need for this.
*
* For 64kB page size we use a 2 level page table tree for a total of 42 bits
* of virtual address space.
*/
#ifdef CONFIG_PAGE_SIZE_4KB
# ifdef CONFIG_MIPS_VA_BITS_48
# define PGD_ORDER 0
# define PUD_ORDER 0
# else
# define PGD_ORDER 1
# define PUD_ORDER aieeee_attempt_to_allocate_pud
# endif
#define PMD_ORDER 0
#define PTE_ORDER 0
#endif
#ifdef CONFIG_PAGE_SIZE_8KB
#define PGD_ORDER 0
#define PUD_ORDER aieeee_attempt_to_allocate_pud
#define PMD_ORDER 0
#define PTE_ORDER 0
#endif
#ifdef CONFIG_PAGE_SIZE_16KB
#ifdef CONFIG_MIPS_VA_BITS_48
#define PGD_ORDER 1
#else
#define PGD_ORDER 0
#endif
#define PUD_ORDER aieeee_attempt_to_allocate_pud
#define PMD_ORDER 0
#define PTE_ORDER 0
#endif
#ifdef CONFIG_PAGE_SIZE_32KB
#define PGD_ORDER 0
#define PUD_ORDER aieeee_attempt_to_allocate_pud
#define PMD_ORDER 0
#define PTE_ORDER 0
#endif
#ifdef CONFIG_PAGE_SIZE_64KB
#define PGD_ORDER 0
#define PUD_ORDER aieeee_attempt_to_allocate_pud
#ifdef CONFIG_MIPS_VA_BITS_48
#define PMD_ORDER 0
#else
#define PMD_ORDER aieeee_attempt_to_allocate_pmd
#endif
#define PTE_ORDER 0
#endif
#define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t))
#ifndef __PAGETABLE_PUD_FOLDED
#define PTRS_PER_PUD ((PAGE_SIZE << PUD_ORDER) / sizeof(pud_t))
#endif
#ifndef __PAGETABLE_PMD_FOLDED
#define PTRS_PER_PMD ((PAGE_SIZE << PMD_ORDER) / sizeof(pmd_t))
#endif
#define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))
#define USER_PTRS_PER_PGD ((TASK_SIZE64 / PGDIR_SIZE)?(TASK_SIZE64 / PGDIR_SIZE):1)
#define FIRST_USER_ADDRESS 0UL
/*
* TLB refill handlers also map the vmalloc area into xuseg. Avoid
* the first couple of pages so NULL pointer dereferences will still
* reliably trap.
*/
#define VMALLOC_START (MAP_BASE + (2 * PAGE_SIZE))
#define VMALLOC_END \
(MAP_BASE + \
min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, \
(1UL << cpu_vmbits)) - (1UL << 32))
#if defined(CONFIG_MODULES) && defined(KBUILD_64BIT_SYM32) && \
VMALLOC_START != CKSSEG
/* Load modules into 32bit-compatible segment. */
#define MODULE_START CKSSEG
#define MODULE_END (FIXADDR_START-2*PAGE_SIZE)
#endif
#define pte_ERROR(e) \
printk("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
#ifndef __PAGETABLE_PMD_FOLDED
#define pmd_ERROR(e) \
printk("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
#endif
#ifndef __PAGETABLE_PUD_FOLDED
#define pud_ERROR(e) \
printk("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))
#endif
#define pgd_ERROR(e) \
printk("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
extern pte_t invalid_pte_table[PTRS_PER_PTE];
#ifndef __PAGETABLE_PUD_FOLDED
/*
* For 4-level pagetables we defines these ourselves, for 3-level the
* definitions are below, for 2-level the
* definitions are supplied by <asm-generic/pgtable-nopmd.h>.
*/
typedef struct { unsigned long pud; } pud_t;
#define pud_val(x) ((x).pud)
#define __pud(x) ((pud_t) { (x) })
extern pud_t invalid_pud_table[PTRS_PER_PUD];
/*
* Empty pgd entries point to the invalid_pud_table.
*/
static inline int p4d_none(p4d_t p4d)
{
return p4d_val(p4d) == (unsigned long)invalid_pud_table;
}
static inline int p4d_bad(p4d_t p4d)
{
if (unlikely(p4d_val(p4d) & ~PAGE_MASK))
return 1;
return 0;
}
static inline int p4d_present(p4d_t p4d)
{
return p4d_val(p4d) != (unsigned long)invalid_pud_table;
}
static inline void p4d_clear(p4d_t *p4dp)
{
p4d_val(*p4dp) = (unsigned long)invalid_pud_table;
}
static inline unsigned long p4d_page_vaddr(p4d_t p4d)
{
return p4d_val(p4d);
}
#define p4d_phys(p4d) virt_to_phys((void *)p4d_val(p4d))
#define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT))
#define p4d_index(address) (((address) >> P4D_SHIFT) & (PTRS_PER_P4D - 1))
static inline void set_p4d(p4d_t *p4d, p4d_t p4dval)
{
*p4d = p4dval;
}
#endif
#ifndef __PAGETABLE_PMD_FOLDED
/*
* For 3-level pagetables we defines these ourselves, for 2-level the
* definitions are supplied by <asm-generic/pgtable-nopmd.h>.
*/
typedef struct { unsigned long pmd; } pmd_t;
#define pmd_val(x) ((x).pmd)
#define __pmd(x) ((pmd_t) { (x) } )
extern pmd_t invalid_pmd_table[PTRS_PER_PMD];
#endif
/*
* Empty pgd/pmd entries point to the invalid_pte_table.
*/
static inline int pmd_none(pmd_t pmd)
{
return pmd_val(pmd) == (unsigned long) invalid_pte_table;
}
static inline int pmd_bad(pmd_t pmd)
{
#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
/* pmd_huge(pmd) but inline */
if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
return 0;
#endif
if (unlikely(pmd_val(pmd) & ~PAGE_MASK))
return 1;
return 0;
}
static inline int pmd_present(pmd_t pmd)
{
#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
return pmd_val(pmd) & _PAGE_PRESENT;
#endif
return pmd_val(pmd) != (unsigned long) invalid_pte_table;
}
static inline void pmd_clear(pmd_t *pmdp)
{
pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
}
#ifndef __PAGETABLE_PMD_FOLDED
/*
* Empty pud entries point to the invalid_pmd_table.
*/
static inline int pud_none(pud_t pud)
{
return pud_val(pud) == (unsigned long) invalid_pmd_table;
}
static inline int pud_bad(pud_t pud)
{
return pud_val(pud) & ~PAGE_MASK;
}
static inline int pud_present(pud_t pud)
{
return pud_val(pud) != (unsigned long) invalid_pmd_table;
}
static inline void pud_clear(pud_t *pudp)
{
pud_val(*pudp) = ((unsigned long) invalid_pmd_table);
}
#endif
#define pte_page(x) pfn_to_page(pte_pfn(x))
#ifdef CONFIG_CPU_VR41XX
#define pte_pfn(x) ((unsigned long)((x).pte >> (PAGE_SHIFT + 2)))
#define pfn_pte(pfn, prot) __pte(((pfn) << (PAGE_SHIFT + 2)) | pgprot_val(prot))
#else
#define pte_pfn(x) ((unsigned long)((x).pte >> _PFN_SHIFT))
#define pfn_pte(pfn, prot) __pte(((pfn) << _PFN_SHIFT) | pgprot_val(prot))
#define pfn_pmd(pfn, prot) __pmd(((pfn) << _PFN_SHIFT) | pgprot_val(prot))
#endif
#ifndef __PAGETABLE_PMD_FOLDED
static inline unsigned long pud_page_vaddr(pud_t pud)
{
return pud_val(pud);
}
#define pud_phys(pud) virt_to_phys((void *)pud_val(pud))
#define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT))
#endif
/*
* Initialize a new pgd / pmd table with invalid pointers.
*/
extern void pgd_init(unsigned long page);
extern void pud_init(unsigned long page, unsigned long pagetable);
extern void pmd_init(unsigned long page, unsigned long pagetable);
/*
* Non-present pages: high 40 bits are offset, next 8 bits type,
* low 16 bits zero.
*/
static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
{ pte_t pte; pte_val(pte) = (type << 16) | (offset << 24); return pte; }
#define __swp_type(x) (((x).val >> 16) & 0xff)
#define __swp_offset(x) ((x).val >> 24)
#define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) })
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
#endif /* _ASM_PGTABLE_64_H */
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