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author | Mike Rapoport <rppt@linux.ibm.com> | 2020-06-05 01:46:19 +0200 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-05 04:06:21 +0200 |
commit | 84e6ffb2c49c7901a9efb54b497d2eb84c3bef8c (patch) | |
tree | bb8213bc64acf8310af77dfbd12324f687b2f7f5 /arch/arm/mm/mmu.c | |
parent | h8300: remove usage of __ARCH_USE_5LEVEL_HACK (diff) | |
download | linux-84e6ffb2c49c7901a9efb54b497d2eb84c3bef8c.tar.xz linux-84e6ffb2c49c7901a9efb54b497d2eb84c3bef8c.zip |
arm: add support for folded p4d page tables
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>
Diffstat (limited to 'arch/arm/mm/mmu.c')
-rw-r--r-- | arch/arm/mm/mmu.c | 35 |
1 files changed, 29 insertions, 6 deletions
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index ec8d0008bfa1..c425288f1a86 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -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); |