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Message-Id: <20250407053113.746295-3-anshuman.khandual@arm.com>
Date: Mon, 7 Apr 2025 11:01:12 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-mm@...ck.org
Cc: mark.rutland@....com,
Anshuman Khandual <anshuman.khandual@....com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Steven Price <steven.price@....com>,
Ryan Roberts <ryan.roberts@....com>,
Madhavan Srinivasan <maddy@...ux.ibm.com>,
Nicholas Piggin <npiggin@...il.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
Heiko Carstens <hca@...ux.ibm.com>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
Alexander Gordeev <agordeev@...ux.ibm.com>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org,
linux-riscv@...ts.infradead.org,
linux-s390@...r.kernel.org,
Dave Hansen <dave.hansen@...ux.intel.com>
Subject: [PATCH V2 2/3] mm/ptdump: Split effective_prot() into level specific callbacks
Last argument in effective_prot() is u64 assuming pxd_val() returned value
(all page table levels) is 64 bit. pxd_val() is very platform specific and
its type should not be assumed in generic MM.
Split effective_prot() into individual page table level specific callbacks
which accepts corresponding pxd_t argument instead and then the subscribing
platform (only x86) just derive pxd_val() from the entries as required and
proceed as earlier.
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Paul Walmsley <paul.walmsley@...ive.com>
Cc: Palmer Dabbelt <palmer@...belt.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: linux-kernel@...r.kernel.org
Cc: linux-riscv@...ts.infradead.org
Cc: linux-mm@...ck.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
arch/x86/mm/dump_pagetables.c | 32 +++++++++++++++++++++++++++++++-
include/linux/ptdump.h | 6 +++++-
mm/ptdump.c | 20 ++++++++++----------
3 files changed, 46 insertions(+), 12 deletions(-)
diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index 2e1c2d006ace..a4700ef6eb64 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -266,6 +266,32 @@ static void effective_prot(struct ptdump_state *pt_st, int level, u64 val)
st->prot_levels[level] = effective;
}
+static void effective_prot_pte(struct ptdump_state *st, pte_t pte)
+{
+ effective_prot(st, 4, pte_val(pte));
+}
+
+static void effective_prot_pmd(struct ptdump_state *st, pmd_t pmd)
+{
+ effective_prot(st, 3, pmd_val(pmd));
+}
+
+static void effective_prot_pud(struct ptdump_state *st, pud_t pud)
+{
+ effective_prot(st, 2, pud_val(pud));
+}
+
+static void effective_prot_p4d(struct ptdump_state *st, p4d_t p4d)
+{
+ effective_prot(st, 1, p4d_val(p4d));
+}
+
+static void effective_prot_pgd(struct ptdump_state *st, pgd_t pgd)
+{
+ effective_prot(st, 0, pgd_val(pgd));
+}
+
+
/*
* This function gets called on a break in a continuous series
* of PTE entries; the next one is different so we need to
@@ -416,7 +442,11 @@ bool ptdump_walk_pgd_level_core(struct seq_file *m,
.note_page_p4d = note_page_p4d,
.note_page_pgd = note_page_pgd,
.note_page_flush = note_page_flush,
- .effective_prot = effective_prot,
+ .effective_prot_pte = effective_prot_pte,
+ .effective_prot_pmd = effective_prot_pmd,
+ .effective_prot_pud = effective_prot_pud,
+ .effective_prot_p4d = effective_prot_p4d,
+ .effective_prot_pgd = effective_prot_pgd,
.range = ptdump_ranges
},
.level = -1,
diff --git a/include/linux/ptdump.h b/include/linux/ptdump.h
index 1c1eb1fae199..240bd3bff18d 100644
--- a/include/linux/ptdump.h
+++ b/include/linux/ptdump.h
@@ -17,7 +17,11 @@ struct ptdump_state {
void (*note_page_p4d)(struct ptdump_state *st, unsigned long addr, p4d_t p4d);
void (*note_page_pgd)(struct ptdump_state *st, unsigned long addr, pgd_t pgd);
void (*note_page_flush)(struct ptdump_state *st);
- void (*effective_prot)(struct ptdump_state *st, int level, u64 val);
+ void (*effective_prot_pte)(struct ptdump_state *st, pte_t pte);
+ void (*effective_prot_pmd)(struct ptdump_state *st, pmd_t pmd);
+ void (*effective_prot_pud)(struct ptdump_state *st, pud_t pud);
+ void (*effective_prot_p4d)(struct ptdump_state *st, p4d_t p4d);
+ void (*effective_prot_pgd)(struct ptdump_state *st, pgd_t pgd);
const struct ptdump_range *range;
};
diff --git a/mm/ptdump.c b/mm/ptdump.c
index 706cfc19439b..9374f29cdc6f 100644
--- a/mm/ptdump.c
+++ b/mm/ptdump.c
@@ -38,8 +38,8 @@ static int ptdump_pgd_entry(pgd_t *pgd, unsigned long addr,
return note_kasan_page_table(walk, addr);
#endif
- if (st->effective_prot)
- st->effective_prot(st, 0, pgd_val(val));
+ if (st->effective_prot_pgd)
+ st->effective_prot_pgd(st, val);
if (pgd_leaf(val)) {
st->note_page_pgd(st, addr, val);
@@ -61,8 +61,8 @@ static int ptdump_p4d_entry(p4d_t *p4d, unsigned long addr,
return note_kasan_page_table(walk, addr);
#endif
- if (st->effective_prot)
- st->effective_prot(st, 1, p4d_val(val));
+ if (st->effective_prot_p4d)
+ st->effective_prot_p4d(st, val);
if (p4d_leaf(val)) {
st->note_page_p4d(st, addr, val);
@@ -84,8 +84,8 @@ static int ptdump_pud_entry(pud_t *pud, unsigned long addr,
return note_kasan_page_table(walk, addr);
#endif
- if (st->effective_prot)
- st->effective_prot(st, 2, pud_val(val));
+ if (st->effective_prot_pud)
+ st->effective_prot_pud(st, val);
if (pud_leaf(val)) {
st->note_page_pud(st, addr, val);
@@ -106,8 +106,8 @@ static int ptdump_pmd_entry(pmd_t *pmd, unsigned long addr,
return note_kasan_page_table(walk, addr);
#endif
- if (st->effective_prot)
- st->effective_prot(st, 3, pmd_val(val));
+ if (st->effective_prot_pmd)
+ st->effective_prot_pmd(st, val);
if (pmd_leaf(val)) {
st->note_page_pmd(st, addr, val);
walk->action = ACTION_CONTINUE;
@@ -122,8 +122,8 @@ static int ptdump_pte_entry(pte_t *pte, unsigned long addr,
struct ptdump_state *st = walk->private;
pte_t val = ptep_get_lockless(pte);
- if (st->effective_prot)
- st->effective_prot(st, 4, pte_val(val));
+ if (st->effective_prot_pte)
+ st->effective_prot_pte(st, val);
st->note_page_pte(st, addr, val);
--
2.25.1
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