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arm: add support for folded p4d page tables

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Implement primitives necessary for the 4th level folding, add walks of p4d
level where appropriate, and remove __ARCH_USE_5LEVEL_HACK.

[rppt@linux.ibm.com: fix kexec]
  Link: http://lkml.kernel.org/r/20200508174232.GA759899@linux.ibm.com
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Brian Cain <bcain@codeaurora.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: James Morse <james.morse@arm.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Julien Thierry <julien.thierry.kdev@gmail.com>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Link: http://lkml.kernel.org/r/20200414153455.21744-3-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Rapoport
2020-06-04 16:46:19 -07:00
committed by Linus Torvalds
parent f426f4edf4
commit 84e6ffb2c4
12 changed files with 126 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
arch/arm/mm/mmu.c
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@@ -357,7 +357,8 @@ static pte_t *pte_offset_late_fixmap(pmd_t *dir, unsigned long addr)
static inline pmd_t * __init fixmap_pmd(unsigned long addr)
{
pgd_t *pgd = pgd_offset_k(addr);
pud_t *pud = pud_offset(pgd, addr);
p4d_t *p4d = p4d_offset(pgd, addr);
pud_t *pud = pud_offset(p4d, addr);
pmd_t *pmd = pmd_offset(pud, addr);
return pmd;
@@ -801,12 +802,12 @@ static void __init alloc_init_pmd(pud_t *pud, unsigned long addr,
} while (pmd++, addr = next, addr != end);
}
static void __init alloc_init_pud(pgd_t *pgd, unsigned long addr,
static void __init alloc_init_pud(p4d_t *p4d, unsigned long addr,
unsigned long end, phys_addr_t phys,
const struct mem_type *type,
void *(*alloc)(unsigned long sz), bool ng)
{
pud_t *pud = pud_offset(pgd, addr);
pud_t *pud = pud_offset(p4d, addr);
unsigned long next;
do {
@@ -816,6 +817,21 @@ static void __init alloc_init_pud(pgd_t *pgd, unsigned long addr,
} while (pud++, addr = next, addr != end);
}
static void __init alloc_init_p4d(pgd_t *pgd, unsigned long addr,
unsigned long end, phys_addr_t phys,
const struct mem_type *type,
void *(*alloc)(unsigned long sz), bool ng)
{
p4d_t *p4d = p4d_offset(pgd, addr);
unsigned long next;
do {
next = p4d_addr_end(addr, end);
alloc_init_pud(p4d, addr, next, phys, type, alloc, ng);
phys += next - addr;
} while (p4d++, addr = next, addr != end);
}
#ifndef CONFIG_ARM_LPAE
static void __init create_36bit_mapping(struct mm_struct *mm,
struct map_desc *md,
@@ -863,7 +879,8 @@ static void __init create_36bit_mapping(struct mm_struct *mm,
pgd = pgd_offset(mm, addr);
end = addr + length;
do {
pud_t *pud = pud_offset(pgd, addr);
p4d_t *p4d = p4d_offset(pgd, addr);
pud_t *pud = pud_offset(p4d, addr);
pmd_t *pmd = pmd_offset(pud, addr);
int i;
@@ -914,7 +931,7 @@ static void __init __create_mapping(struct mm_struct *mm, struct map_desc *md,
do {
unsigned long next = pgd_addr_end(addr, end);
alloc_init_pud(pgd, addr, next, phys, type, alloc, ng);
alloc_init_p4d(pgd, addr, next, phys, type, alloc, ng);
phys += next - addr;
addr = next;
@@ -950,7 +967,13 @@ void __init create_mapping_late(struct mm_struct *mm, struct map_desc *md,
bool ng)
{
#ifdef CONFIG_ARM_LPAE
pud_t *pud = pud_alloc(mm, pgd_offset(mm, md->virtual), md->virtual);
p4d_t *p4d;
pud_t *pud;
p4d = p4d_alloc(mm, pgd_offset(mm, md->virtual), md->virtual);
if (!WARN_ON(!p4d))
return;
pud = pud_alloc(mm, p4d, md->virtual);
if (WARN_ON(!pud))
return;
pmd_alloc(mm, pud, 0);