From: Steven Price <steven.price@arm.com> To: Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org Cc: "Steven Price" <steven.price@arm.com>, "Andy Lutomirski" <luto@kernel.org>, "Ard Biesheuvel" <ard.biesheuvel@linaro.org>, "Arnd Bergmann" <arnd@arndb.de>, "Borislav Petkov" <bp@alien8.de>, "Catalin Marinas" <catalin.marinas@arm.com>, "Dave Hansen" <dave.hansen@linux.intel.com>, "Ingo Molnar" <mingo@redhat.com>, "James Morse" <james.morse@arm.com>, "Jérôme Glisse" <jglisse@redhat.com>, "Peter Zijlstra" <peterz@infradead.org>, "Thomas Gleixner" <tglx@linutronix.de>, "Will Deacon" <will@kernel.org>, x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, "Mark Rutland" <Mark.Rutland@arm.com>, "Liang, Kan" <kan.liang@linux.intel.com>, "Mark Rutland" <mark.rutland@arm.com> Subject: [PATCH v16 01/25] mm: Add generic p?d_leaf() macros Date: Fri, 6 Dec 2019 13:52:52 +0000 [thread overview] Message-ID: <20191206135316.47703-2-steven.price@arm.com> (raw) In-Reply-To: <20191206135316.47703-1-steven.price@arm.com> Exposing the pud/pgd levels of the page tables to walk_page_range() means we may come across the exotic large mappings that come with large areas of contiguous memory (such as the kernel's linear map). For architectures that don't provide all p?d_leaf() macros, provide generic do nothing default that are suitable where there cannot be leaf pages at that level. Futher patches will add implementations for individual architectures. The name p?d_leaf() is chosen to minimize the confusion with existing uses of "large" pages and "huge" pages which do not necessary mean that the entry is a leaf (for example it may be a set of contiguous entries that only take 1 TLB slot). For the purpose of walking the page tables we don't need to know how it will be represented in the TLB, but we do need to know for sure if it is a leaf of the tree. Signed-off-by: Steven Price <steven.price@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> --- include/asm-generic/pgtable.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index 798ea36a0549..e2e2bef07dd2 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -1238,4 +1238,24 @@ static inline bool arch_has_pfn_modify_check(void) #define mm_pmd_folded(mm) __is_defined(__PAGETABLE_PMD_FOLDED) #endif +/* + * p?d_leaf() - true if this entry is a final mapping to a physical address. + * This differs from p?d_huge() by the fact that they are always available (if + * the architecture supports large pages at the appropriate level) even + * if CONFIG_HUGETLB_PAGE is not defined. + * Only meaningful when called on a valid entry. + */ +#ifndef pgd_leaf +#define pgd_leaf(x) 0 +#endif +#ifndef p4d_leaf +#define p4d_leaf(x) 0 +#endif +#ifndef pud_leaf +#define pud_leaf(x) 0 +#endif +#ifndef pmd_leaf +#define pmd_leaf(x) 0 +#endif + #endif /* _ASM_GENERIC_PGTABLE_H */ -- 2.20.1
WARNING: multiple messages have this Message-ID (diff)
From: Steven Price <steven.price@arm.com> To: Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org Cc: "Mark Rutland" <mark.rutland@arm.com>, x86@kernel.org, "Arnd Bergmann" <arnd@arndb.de>, "Ard Biesheuvel" <ard.biesheuvel@linaro.org>, "Peter Zijlstra" <peterz@infradead.org>, "Catalin Marinas" <catalin.marinas@arm.com>, "Dave Hansen" <dave.hansen@linux.intel.com>, linux-kernel@vger.kernel.org, "Steven Price" <steven.price@arm.com>, "Jérôme Glisse" <jglisse@redhat.com>, "Ingo Molnar" <mingo@redhat.com>, "Borislav Petkov" <bp@alien8.de>, "Andy Lutomirski" <luto@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>, "James Morse" <james.morse@arm.com>, "Thomas Gleixner" <tglx@linutronix.de>, "Will Deacon" <will@kernel.org>, linux-arm-kernel@lists.infradead.org, "Liang, Kan" <kan.liang@linux.intel.com> Subject: [PATCH v16 01/25] mm: Add generic p?d_leaf() macros Date: Fri, 6 Dec 2019 13:52:52 +0000 [thread overview] Message-ID: <20191206135316.47703-2-steven.price@arm.com> (raw) In-Reply-To: <20191206135316.47703-1-steven.price@arm.com> Exposing the pud/pgd levels of the page tables to walk_page_range() means we may come across the exotic large mappings that come with large areas of contiguous memory (such as the kernel's linear map). For architectures that don't provide all p?d_leaf() macros, provide generic do nothing default that are suitable where there cannot be leaf pages at that level. Futher patches will add implementations for individual architectures. The name p?d_leaf() is chosen to minimize the confusion with existing uses of "large" pages and "huge" pages which do not necessary mean that the entry is a leaf (for example it may be a set of contiguous entries that only take 1 TLB slot). For the purpose of walking the page tables we don't need to know how it will be represented in the TLB, but we do need to know for sure if it is a leaf of the tree. Signed-off-by: Steven Price <steven.price@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> --- include/asm-generic/pgtable.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index 798ea36a0549..e2e2bef07dd2 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -1238,4 +1238,24 @@ static inline bool arch_has_pfn_modify_check(void) #define mm_pmd_folded(mm) __is_defined(__PAGETABLE_PMD_FOLDED) #endif +/* + * p?d_leaf() - true if this entry is a final mapping to a physical address. + * This differs from p?d_huge() by the fact that they are always available (if + * the architecture supports large pages at the appropriate level) even + * if CONFIG_HUGETLB_PAGE is not defined. + * Only meaningful when called on a valid entry. + */ +#ifndef pgd_leaf +#define pgd_leaf(x) 0 +#endif +#ifndef p4d_leaf +#define p4d_leaf(x) 0 +#endif +#ifndef pud_leaf +#define pud_leaf(x) 0 +#endif +#ifndef pmd_leaf +#define pmd_leaf(x) 0 +#endif + #endif /* _ASM_GENERIC_PGTABLE_H */ -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-12-06 13:53 UTC|newest] Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-12-06 13:52 [PATCH v16 00/25] Generic page walk and ptdump Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:52 ` Steven Price [this message] 2019-12-06 13:52 ` [PATCH v16 01/25] mm: Add generic p?d_leaf() macros Steven Price 2019-12-06 13:52 ` [PATCH v16 02/25] arc: mm: Add p?d_leaf() definitions Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:52 ` [PATCH v16 03/25] arm: " Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:52 ` [PATCH v16 04/25] arm64: " Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:52 ` [PATCH v16 05/25] mips: " Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:52 ` [PATCH v16 06/25] powerpc: " Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-09 11:08 ` Michael Ellerman 2019-12-09 11:08 ` Michael Ellerman 2019-12-09 11:08 ` Michael Ellerman 2019-12-09 11:08 ` Michael Ellerman 2019-12-09 13:06 ` Steven Price 2019-12-09 13:06 ` Steven Price 2019-12-09 13:06 ` Steven Price 2019-12-09 13:06 ` Steven Price 2019-12-06 13:52 ` [PATCH v16 07/25] riscv: " Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:52 ` [PATCH v16 08/25] s390: " Steven Price 2019-12-06 13:52 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 09/25] sparc: " Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 10/25] x86: " Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 11/25] mm: pagewalk: Add p4d_entry() and pgd_entry() Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-12 11:23 ` Thomas Hellström (VMware) 2019-12-12 11:23 ` Thomas Hellström (VMware) 2019-12-12 11:33 ` Thomas Hellström (VMware) 2019-12-12 11:33 ` Thomas Hellström (VMware) 2019-12-12 13:15 ` Steven Price 2019-12-12 13:15 ` Steven Price 2019-12-12 14:04 ` Thomas Hellström (VMware) 2019-12-12 14:04 ` Thomas Hellström (VMware) 2019-12-12 15:18 ` Steven Price 2019-12-12 15:18 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 12/25] mm: pagewalk: Allow walking without vma Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 13/25] mm: pagewalk: Don't lock PTEs for walk_page_range_novma() Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-10 11:23 ` kbuild test robot 2019-12-10 11:23 ` kbuild test robot 2019-12-10 11:23 ` kbuild test robot 2019-12-11 15:54 ` Steven Price 2019-12-11 15:54 ` Steven Price 2019-12-11 15:54 ` Steven Price 2019-12-11 17:12 ` Luc Van Oostenryck 2019-12-11 17:12 ` Luc Van Oostenryck 2019-12-11 17:19 ` Qian Cai 2019-12-11 17:19 ` Qian Cai 2019-12-06 13:53 ` [PATCH v16 14/25] mm: pagewalk: fix termination condition in walk_pte_range() Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 15/25] mm: pagewalk: Add test_p?d callbacks Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 16/25] mm: pagewalk: Add 'depth' parameter to pte_hole Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 17/25] x86: mm: Point to struct seq_file from struct pg_state Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 18/25] x86: mm+efi: Convert ptdump_walk_pgd_level() to take a mm_struct Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 19/25] x86: mm: Convert ptdump_walk_pgd_level_debugfs() to take an mm_struct Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 20/25] x86: mm: Convert ptdump_walk_pgd_level_core() " Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 21/25] mm: Add generic ptdump Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 22/25] x86: mm: Convert dump_pagetables to use walk_page_range Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 23/25] arm64: mm: Convert mm/dump.c to use walk_page_range() Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 24/25] arm64: mm: Display non-present entries in ptdump Steven Price 2019-12-06 13:53 ` Steven Price 2019-12-06 13:53 ` [PATCH v16 25/25] mm: ptdump: Reduce level numbers by 1 in note_page() Steven Price 2019-12-06 13:53 ` Steven Price
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