From: Steven Price <steven.price@arm.com>
To: 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.deacon@arm.com>,
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>
Subject: [PATCH v3 28/34] mm: pagewalk: Add test_p?d callbacks
Date: Wed, 27 Feb 2019 17:06:02 +0000 [thread overview]
Message-ID: <20190227170608.27963-29-steven.price@arm.com> (raw)
In-Reply-To: <20190227170608.27963-1-steven.price@arm.com>
It is useful to be able to skip parts of the page table tree even when
walking without VMAs. Add test_p?d callbacks similar to test_walk but
which are called just before a table at that level is walked. If the
callback returns non-zero then the entire table is skipped.
Signed-off-by: Steven Price <steven.price@arm.com>
---
include/linux/mm.h | 11 +++++++++++
mm/pagewalk.c | 24 ++++++++++++++++++++++++
2 files changed, 35 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 4ae3634a9118..581f31c6b6d9 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1429,6 +1429,11 @@ void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
* value means "do page table walk over the current vma,"
* and a negative one means "abort current page table walk
* right now." 1 means "skip the current vma."
+ * @test_pmd: similar to test_walk(), but called for every pmd.
+ * @test_pud: similar to test_walk(), but called for every pud.
+ * @test_p4d: similar to test_walk(), but called for every p4d.
+ * Returning 0 means walk this part of the page tables,
+ * returning 1 means to skip this range.
* @mm: mm_struct representing the target process of page table walk
* @vma: vma currently walked (NULL if walking outside vmas)
* @private: private data for callbacks' usage
@@ -1453,6 +1458,12 @@ struct mm_walk {
struct mm_walk *walk);
int (*test_walk)(unsigned long addr, unsigned long next,
struct mm_walk *walk);
+ int (*test_pmd)(unsigned long addr, unsigned long next,
+ pmd_t *pmd_start, struct mm_walk *walk);
+ int (*test_pud)(unsigned long addr, unsigned long next,
+ pud_t *pud_start, struct mm_walk *walk);
+ int (*test_p4d)(unsigned long addr, unsigned long next,
+ p4d_t *p4d_start, struct mm_walk *walk);
struct mm_struct *mm;
struct vm_area_struct *vma;
void *private;
diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index 57946bcd810c..ff2fc8490435 100644
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -49,6 +49,14 @@ static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
int err = 0;
int depth = real_depth(3);
+ if (walk->test_pmd) {
+ err = walk->test_pmd(addr, end, pmd_offset(pud, 0), walk);
+ if (err < 0)
+ return err;
+ if (err > 0)
+ return 0;
+ }
+
pmd = pmd_offset(pud, addr);
do {
again:
@@ -100,6 +108,14 @@ static int walk_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end,
int err = 0;
int depth = real_depth(2);
+ if (walk->test_pud) {
+ err = walk->test_pud(addr, end, pud_offset(p4d, 0), walk);
+ if (err < 0)
+ return err;
+ if (err > 0)
+ return 0;
+ }
+
pud = pud_offset(p4d, addr);
do {
again:
@@ -143,6 +159,14 @@ static int walk_p4d_range(pgd_t *pgd, unsigned long addr, unsigned long end,
int err = 0;
int depth = real_depth(1);
+ if (walk->test_p4d) {
+ err = walk->test_p4d(addr, end, p4d_offset(pgd, 0), walk);
+ if (err < 0)
+ return err;
+ if (err > 0)
+ return 0;
+ }
+
p4d = p4d_offset(pgd, addr);
do {
next = p4d_addr_end(addr, end);
--
2.20.1
next prev parent reply other threads:[~2019-02-27 17:08 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-27 17:05 [PATCH v3 00/34] Convert x86 & arm64 to use generic page walk Steven Price
2019-02-27 17:05 ` [PATCH v3 01/34] alpha: mm: Add p?d_large() definitions Steven Price
2019-02-27 17:05 ` [PATCH v3 02/34] arc: " Steven Price
2019-02-27 18:18 ` Vineet Gupta
2019-02-27 17:05 ` [PATCH v3 03/34] arm: " Steven Price
2019-03-01 21:47 ` Kirill A. Shutemov
2019-03-04 11:56 ` Steven Price
2019-03-04 13:10 ` Kirill A. Shutemov
2019-02-27 17:05 ` [PATCH v3 04/34] arm64: " Steven Price
2019-02-27 17:05 ` [PATCH v3 05/34] c6x: " Steven Price
2019-03-01 21:48 ` Kirill A. Shutemov
2019-03-04 12:01 ` Steven Price
2019-03-04 13:11 ` Kirill A. Shutemov
2019-02-27 17:05 ` [PATCH v3 06/34] csky: " Steven Price
2019-03-01 21:51 ` Kirill A. Shutemov
2019-02-27 17:05 ` [PATCH v3 07/34] hexagon: " Steven Price
2019-02-27 17:05 ` [PATCH v3 08/34] ia64: " Steven Price
2019-03-01 21:57 ` Kirill A. Shutemov
2019-03-04 13:16 ` Steven Price
2019-03-04 19:06 ` Luck, Tony
2019-03-06 13:45 ` Steven Price
2019-02-27 17:05 ` [PATCH v3 09/34] m68k: " Steven Price
2019-02-27 19:27 ` Geert Uytterhoeven
2019-02-28 11:36 ` Mike Rapoport
2019-02-28 11:53 ` Geert Uytterhoeven
2019-02-28 12:04 ` Steven Price
2019-03-01 11:45 ` Mike Rapoport
2019-02-27 17:05 ` [PATCH v3 10/34] microblaze: " Steven Price
2019-02-27 17:05 ` [PATCH v3 11/34] mips: " Steven Price
2019-02-28 2:15 ` Paul Burton
2019-02-28 12:11 ` Steven Price
2019-02-28 18:55 ` Paul Burton
2019-03-01 11:02 ` Steven Price
2019-02-27 17:05 ` [PATCH v3 12/34] nds32: " Steven Price
2019-02-27 17:05 ` [PATCH v3 13/34] nios2: " Steven Price
2019-02-27 17:05 ` [PATCH v3 14/34] openrisc: " Steven Price
2019-02-27 17:05 ` [PATCH v3 15/34] parisc: " Steven Price
2019-02-27 18:54 ` Helge Deller
2019-03-01 22:12 ` Kirill A. Shutemov
2019-03-05 21:45 ` Helge Deller
2019-02-27 17:05 ` [PATCH v3 16/34] powerpc: " Steven Price
2019-02-27 17:05 ` [PATCH v3 17/34] riscv: " Steven Price
2019-02-27 17:05 ` [PATCH v3 18/34] s390: " Steven Price
2019-02-27 17:40 ` Martin Schwidefsky
2019-02-28 11:43 ` Steven Price
2019-02-27 17:05 ` [PATCH v3 19/34] sh: " Steven Price
2019-02-27 17:05 ` [PATCH v3 20/34] sparc: " Steven Price
2019-02-27 18:38 ` David Miller
2019-02-28 11:49 ` Steven Price
2019-02-27 17:05 ` [PATCH v3 21/34] um: " Steven Price
2019-02-27 17:05 ` [PATCH v3 22/34] unicore32: " Steven Price
2019-02-27 17:05 ` [PATCH v3 23/34] xtensa: " Steven Price
2019-02-27 17:29 ` Max Filippov
2019-02-27 17:05 ` [PATCH v3 24/34] mm: Add generic p?d_large() macros Steven Price
2019-02-27 17:05 ` [PATCH v3 25/34] mm: pagewalk: Add p4d_entry() and pgd_entry() Steven Price
2019-02-27 17:06 ` [PATCH v3 26/34] mm: pagewalk: Allow walking without vma Steven Price
2019-02-27 17:06 ` [PATCH v3 27/34] mm: pagewalk: Add 'depth' parameter to pte_hole Steven Price
2019-02-27 17:38 ` Dave Hansen
2019-02-28 11:28 ` Steven Price
2019-02-28 19:00 ` Dave Hansen
2019-03-01 11:24 ` Steven Price
2019-02-27 17:06 ` Steven Price [this message]
2019-02-27 17:06 ` [PATCH v3 29/34] arm64: mm: Convert mm/dump.c to use walk_page_range() Steven Price
2019-02-27 17:06 ` [PATCH v3 30/34] x86/mm: Point to struct seq_file from struct pg_state Steven Price
2019-02-27 17:06 ` [PATCH v3 31/34] x86/mm+efi: Convert ptdump_walk_pgd_level() to take a mm_struct Steven Price
2019-02-27 17:06 ` [PATCH v3 32/34] x86/mm: Convert ptdump_walk_pgd_level_debugfs() to take an mm_struct Steven Price
2019-02-27 17:06 ` [PATCH v3 33/34] x86/mm: Convert ptdump_walk_pgd_level_core() " Steven Price
2019-02-27 17:06 ` [PATCH v3 34/34] x86: mm: Convert dump_pagetables to use walk_page_range Steven Price
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