From: Mike Rapoport <rppt@xxxxxxxxxxxxx> Subject: ia64: add support for folded p4d page tables Implement primitives necessary for the 4th level folding, add walks of p4d level where appropriate, remove usage of __ARCH_USE_5LEVEL_HACK and replace 5level-fixup.h with pgtable-nop4d.h Link: http://lkml.kernel.org/r/20200414153455.21744-6-rppt@xxxxxxxxxx Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> Cc: Brian Cain <bcain@xxxxxxxxxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Christophe Leroy <christophe.leroy@xxxxxx> Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx> Cc: Geert Uytterhoeven <geert+renesas@xxxxxxxxx> Cc: Guan Xuetao <gxt@xxxxxxxxxx> Cc: James Morse <james.morse@xxxxxxx> Cc: Jonas Bonn <jonas@xxxxxxxxxxxx> Cc: Julien Thierry <julien.thierry.kdev@xxxxxxxxx> Cc: Ley Foon Tan <ley.foon.tan@xxxxxxxxx> Cc: Marc Zyngier <maz@xxxxxxxxxx> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Cc: Paul Mackerras <paulus@xxxxxxxxx> Cc: Rich Felker <dalias@xxxxxxxx> Cc: Russell King <linux@xxxxxxxxxxxxxxx> Cc: Stafford Horne <shorne@xxxxxxxxx> Cc: Stefan Kristiansson <stefan.kristiansson@xxxxxxxxxxxxx> Cc: Suzuki K Poulose <suzuki.poulose@xxxxxxx> Cc: Tony Luck <tony.luck@xxxxxxxxx> Cc: Will Deacon <will@xxxxxxxxxx> Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- arch/ia64/include/asm/pgalloc.h | 4 ++-- arch/ia64/include/asm/pgtable.h | 17 ++++++++--------- arch/ia64/mm/fault.c | 7 ++++++- arch/ia64/mm/hugetlbpage.c | 18 ++++++++++++------ arch/ia64/mm/init.c | 28 ++++++++++++++++++++++++---- 5 files changed, 52 insertions(+), 22 deletions(-) --- a/arch/ia64/include/asm/pgalloc.h~ia64-add-support-for-folded-p4d-page-tables +++ a/arch/ia64/include/asm/pgalloc.h @@ -36,9 +36,9 @@ static inline void pgd_free(struct mm_st #if CONFIG_PGTABLE_LEVELS == 4 static inline void -pgd_populate(struct mm_struct *mm, pgd_t * pgd_entry, pud_t * pud) +p4d_populate(struct mm_struct *mm, p4d_t * p4d_entry, pud_t * pud) { - pgd_val(*pgd_entry) = __pa(pud); + p4d_val(*p4d_entry) = __pa(pud); } static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) --- a/arch/ia64/include/asm/pgtable.h~ia64-add-support-for-folded-p4d-page-tables +++ a/arch/ia64/include/asm/pgtable.h @@ -283,12 +283,12 @@ extern unsigned long VMALLOC_END; #define pud_page(pud) virt_to_page((pud_val(pud) + PAGE_OFFSET)) #if CONFIG_PGTABLE_LEVELS == 4 -#define pgd_none(pgd) (!pgd_val(pgd)) -#define pgd_bad(pgd) (!ia64_phys_addr_valid(pgd_val(pgd))) -#define pgd_present(pgd) (pgd_val(pgd) != 0UL) -#define pgd_clear(pgdp) (pgd_val(*(pgdp)) = 0UL) -#define pgd_page_vaddr(pgd) ((unsigned long) __va(pgd_val(pgd) & _PFN_MASK)) -#define pgd_page(pgd) virt_to_page((pgd_val(pgd) + PAGE_OFFSET)) +#define p4d_none(p4d) (!p4d_val(p4d)) +#define p4d_bad(p4d) (!ia64_phys_addr_valid(p4d_val(p4d))) +#define p4d_present(p4d) (p4d_val(p4d) != 0UL) +#define p4d_clear(p4dp) (p4d_val(*(p4dp)) = 0UL) +#define p4d_page_vaddr(p4d) ((unsigned long) __va(p4d_val(p4d) & _PFN_MASK)) +#define p4d_page(p4d) virt_to_page((p4d_val(p4d) + PAGE_OFFSET)) #endif /* @@ -386,7 +386,7 @@ pgd_offset (const struct mm_struct *mm, #if CONFIG_PGTABLE_LEVELS == 4 /* Find an entry in the second-level page table.. */ #define pud_offset(dir,addr) \ - ((pud_t *) pgd_page_vaddr(*(dir)) + (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))) + ((pud_t *) p4d_page_vaddr(*(dir)) + (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))) #endif /* Find an entry in the third-level page table.. */ @@ -580,10 +580,9 @@ extern struct page *zero_page_memmap_ptr #if CONFIG_PGTABLE_LEVELS == 3 -#define __ARCH_USE_5LEVEL_HACK #include <asm-generic/pgtable-nopud.h> #endif -#include <asm-generic/5level-fixup.h> +#include <asm-generic/pgtable-nop4d.h> #include <asm-generic/pgtable.h> #endif /* _ASM_IA64_PGTABLE_H */ --- a/arch/ia64/mm/fault.c~ia64-add-support-for-folded-p4d-page-tables +++ a/arch/ia64/mm/fault.c @@ -29,6 +29,7 @@ static int mapped_kernel_page_is_present (unsigned long address) { pgd_t *pgd; + p4d_t *p4d; pud_t *pud; pmd_t *pmd; pte_t *ptep, pte; @@ -37,7 +38,11 @@ mapped_kernel_page_is_present (unsigned if (pgd_none(*pgd) || pgd_bad(*pgd)) return 0; - pud = pud_offset(pgd, address); + p4d = p4d_offset(pgd, address); + if (p4d_none(*p4d) || p4d_bad(*p4d)) + return 0; + + pud = pud_offset(p4d, address); if (pud_none(*pud) || pud_bad(*pud)) return 0; --- a/arch/ia64/mm/hugetlbpage.c~ia64-add-support-for-folded-p4d-page-tables +++ a/arch/ia64/mm/hugetlbpage.c @@ -30,12 +30,14 @@ huge_pte_alloc(struct mm_struct *mm, uns { unsigned long taddr = htlbpage_to_page(addr); pgd_t *pgd; + p4d_t *p4d; pud_t *pud; pmd_t *pmd; pte_t *pte = NULL; pgd = pgd_offset(mm, taddr); - pud = pud_alloc(mm, pgd, taddr); + p4d = p4d_offset(pgd, taddr); + pud = pud_alloc(mm, p4d, taddr); if (pud) { pmd = pmd_alloc(mm, pud, taddr); if (pmd) @@ -49,17 +51,21 @@ huge_pte_offset (struct mm_struct *mm, u { unsigned long taddr = htlbpage_to_page(addr); pgd_t *pgd; + p4d_t *p4d; pud_t *pud; pmd_t *pmd; pte_t *pte = NULL; pgd = pgd_offset(mm, taddr); if (pgd_present(*pgd)) { - pud = pud_offset(pgd, taddr); - if (pud_present(*pud)) { - pmd = pmd_offset(pud, taddr); - if (pmd_present(*pmd)) - pte = pte_offset_map(pmd, taddr); + p4d = p4d_offset(pgd, addr); + if (p4d_present(*p4d)) { + pud = pud_offset(p4d, taddr); + if (pud_present(*pud)) { + pmd = pmd_offset(pud, taddr); + if (pmd_present(*pmd)) + pte = pte_offset_map(pmd, taddr); + } } } --- a/arch/ia64/mm/init.c~ia64-add-support-for-folded-p4d-page-tables +++ a/arch/ia64/mm/init.c @@ -208,6 +208,7 @@ static struct page * __init put_kernel_page (struct page *page, unsigned long address, pgprot_t pgprot) { pgd_t *pgd; + p4d_t *p4d; pud_t *pud; pmd_t *pmd; pte_t *pte; @@ -215,7 +216,10 @@ put_kernel_page (struct page *page, unsi pgd = pgd_offset_k(address); /* note: this is NOT pgd_offset()! */ { - pud = pud_alloc(&init_mm, pgd, address); + p4d = p4d_alloc(&init_mm, pgd, address); + if (!p4d) + goto out; + pud = pud_alloc(&init_mm, p4d, address); if (!pud) goto out; pmd = pmd_alloc(&init_mm, pud, address); @@ -382,6 +386,7 @@ int vmemmap_find_next_valid_pfn(int node do { pgd_t *pgd; + p4d_t *p4d; pud_t *pud; pmd_t *pmd; pte_t *pte; @@ -392,7 +397,13 @@ int vmemmap_find_next_valid_pfn(int node continue; } - pud = pud_offset(pgd, end_address); + p4d = p4d_offset(pgd, end_address); + if (p4d_none(*p4d)) { + end_address += P4D_SIZE; + continue; + } + + pud = pud_offset(p4d, end_address); if (pud_none(*pud)) { end_address += PUD_SIZE; continue; @@ -430,6 +441,7 @@ int __init create_mem_map_page_table(u64 struct page *map_start, *map_end; int node; pgd_t *pgd; + p4d_t *p4d; pud_t *pud; pmd_t *pmd; pte_t *pte; @@ -444,12 +456,20 @@ int __init create_mem_map_page_table(u64 for (address = start_page; address < end_page; address += PAGE_SIZE) { pgd = pgd_offset_k(address); if (pgd_none(*pgd)) { + p4d = memblock_alloc_node(PAGE_SIZE, PAGE_SIZE, node); + if (!p4d) + goto err_alloc; + pgd_populate(&init_mm, pgd, p4d); + } + p4d = p4d_offset(pgd, address); + + if (p4d_none(*p4d)) { pud = memblock_alloc_node(PAGE_SIZE, PAGE_SIZE, node); if (!pud) goto err_alloc; - pgd_populate(&init_mm, pgd, pud); + p4d_populate(&init_mm, p4d, pud); } - pud = pud_offset(pgd, address); + pud = pud_offset(p4d, address); if (pud_none(*pud)) { pmd = memblock_alloc_node(PAGE_SIZE, PAGE_SIZE, node); _
