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[217.140.101.70]) by mx.google.com with ESMTP id q2si4217337edn.429.2019.04.03.07.18.06 for ; Wed, 03 Apr 2019 07:18:07 -0700 (PDT) Received-SPF: pass (google.com: domain of steven.price@arm.com designates 217.140.101.70 as permitted sender) client-ip=217.140.101.70; Authentication-Results: mx.google.com; spf=pass (google.com: domain of steven.price@arm.com designates 217.140.101.70 as permitted sender) smtp.mailfrom=steven.price@arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 2A999EBD; Wed, 3 Apr 2019 07:18:06 -0700 (PDT) Received: from e112269-lin.arm.com (e112269-lin.cambridge.arm.com [10.1.196.69]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id BFC9E3F68F; Wed, 3 Apr 2019 07:18:02 -0700 (PDT) From: Steven Price To: linux-mm@kvack.org Cc: Steven Price , Andy Lutomirski , Ard Biesheuvel , Arnd Bergmann , Borislav Petkov , Catalin Marinas , Dave Hansen , Ingo Molnar , James Morse , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Peter Zijlstra , Thomas Gleixner , Will Deacon , x86@kernel.org, "H. Peter Anvin" , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Mark Rutland , "Liang, Kan" , Andrew Morton Subject: [PATCH v8 14/20] arm64: mm: Convert mm/dump.c to use walk_page_range() Date: Wed, 3 Apr 2019 15:16:21 +0100 Message-Id: <20190403141627.11664-15-steven.price@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190403141627.11664-1-steven.price@arm.com> References: <20190403141627.11664-1-steven.price@arm.com> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Now walk_page_range() can walk kernel page tables, we can switch the arm64 ptdump code over to using it, simplifying the code. Signed-off-by: Steven Price --- arch/arm64/mm/dump.c | 117 ++++++++++++++++++++++--------------------- 1 file changed, 59 insertions(+), 58 deletions(-) diff --git a/arch/arm64/mm/dump.c b/arch/arm64/mm/dump.c index 14fe23cd5932..ea20c1213498 100644 --- a/arch/arm64/mm/dump.c +++ b/arch/arm64/mm/dump.c @@ -72,7 +72,7 @@ struct pg_state { struct seq_file *seq; const struct addr_marker *marker; unsigned long start_address; - unsigned level; + int level; u64 current_prot; bool check_wx; unsigned long wx_pages; @@ -234,11 +234,14 @@ static void note_prot_wx(struct pg_state *st, unsigned long addr) st->wx_pages += (addr - st->start_address) / PAGE_SIZE; } -static void note_page(struct pg_state *st, unsigned long addr, unsigned level, +static void note_page(struct pg_state *st, unsigned long addr, int level, u64 val) { static const char units[] = "KMGTPE"; - u64 prot = val & pg_level[level].mask; + u64 prot = 0; + + if (level >= 0) + prot = val & pg_level[level].mask; if (!st->level) { st->level = level; @@ -286,73 +289,71 @@ static void note_page(struct pg_state *st, unsigned long addr, unsigned level, } -static void walk_pte(struct pg_state *st, pmd_t *pmdp, unsigned long start, - unsigned long end) +static int pud_entry(pud_t *pud, unsigned long addr, + unsigned long next, struct mm_walk *walk) { - unsigned long addr = start; - pte_t *ptep = pte_offset_kernel(pmdp, start); + struct pg_state *st = walk->private; + pud_t val = READ_ONCE(*pud); + + if (pud_table(val)) + return 0; + + note_page(st, addr, 2, pud_val(val)); - do { - note_page(st, addr, 4, READ_ONCE(pte_val(*ptep))); - } while (ptep++, addr += PAGE_SIZE, addr != end); + return 0; } -static void walk_pmd(struct pg_state *st, pud_t *pudp, unsigned long start, - unsigned long end) +static int pmd_entry(pmd_t *pmd, unsigned long addr, + unsigned long next, struct mm_walk *walk) { - unsigned long next, addr = start; - pmd_t *pmdp = pmd_offset(pudp, start); - - do { - pmd_t pmd = READ_ONCE(*pmdp); - next = pmd_addr_end(addr, end); - - if (pmd_none(pmd) || pmd_sect(pmd)) { - note_page(st, addr, 3, pmd_val(pmd)); - } else { - BUG_ON(pmd_bad(pmd)); - walk_pte(st, pmdp, addr, next); - } - } while (pmdp++, addr = next, addr != end); + struct pg_state *st = walk->private; + pmd_t val = READ_ONCE(*pmd); + + if (pmd_table(val)) + return 0; + + note_page(st, addr, 3, pmd_val(val)); + + return 0; } -static void walk_pud(struct pg_state *st, pgd_t *pgdp, unsigned long start, - unsigned long end) +static int pte_entry(pte_t *pte, unsigned long addr, + unsigned long next, struct mm_walk *walk) { - unsigned long next, addr = start; - pud_t *pudp = pud_offset(pgdp, start); - - do { - pud_t pud = READ_ONCE(*pudp); - next = pud_addr_end(addr, end); - - if (pud_none(pud) || pud_sect(pud)) { - note_page(st, addr, 2, pud_val(pud)); - } else { - BUG_ON(pud_bad(pud)); - walk_pmd(st, pudp, addr, next); - } - } while (pudp++, addr = next, addr != end); + struct pg_state *st = walk->private; + pte_t val = READ_ONCE(*pte); + + note_page(st, addr, 4, pte_val(val)); + + return 0; +} + +static int pte_hole(unsigned long addr, unsigned long next, + struct mm_walk *walk) +{ + struct pg_state *st = walk->private; + + note_page(st, addr, -1, 0); + + return 0; } static void walk_pgd(struct pg_state *st, struct mm_struct *mm, - unsigned long start) + unsigned long start) { - unsigned long end = (start < TASK_SIZE_64) ? TASK_SIZE_64 : 0; - unsigned long next, addr = start; - pgd_t *pgdp = pgd_offset(mm, start); - - do { - pgd_t pgd = READ_ONCE(*pgdp); - next = pgd_addr_end(addr, end); - - if (pgd_none(pgd)) { - note_page(st, addr, 1, pgd_val(pgd)); - } else { - BUG_ON(pgd_bad(pgd)); - walk_pud(st, pgdp, addr, next); - } - } while (pgdp++, addr = next, addr != end); + struct mm_walk walk = { + .mm = mm, + .private = st, + .pud_entry = pud_entry, + .pmd_entry = pmd_entry, + .pte_entry = pte_entry, + .pte_hole = pte_hole + }; + down_read(&mm->mmap_sem); + walk_page_range(start, start | (((unsigned long)PTRS_PER_PGD << + PGDIR_SHIFT) - 1), + &walk); + up_read(&mm->mmap_sem); } void ptdump_walk_pgd(struct seq_file *m, struct ptdump_info *info)