[PATCH v5 6/6] arm64: Add HAVE_IOREMAP_PROT support
From: Kefeng Wang <hidden>
Date: 2022-06-07 12:41:13
Also in:
linux-mm, lkml
Subsystem:
arm64 port (aarch64 architecture), documentation, the rest · Maintainers:
Catalin Marinas, Will Deacon, Jonathan Corbet, Linus Torvalds
With ioremap_prot() definition from generic ioremap, also move pte_pgprot() from hugetlbpage.c into pgtable.h, then arm64 could have HAVE_IOREMAP_PROT, which will enable generic_access_phys() code, it is useful for debug, eg, gdb. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Anshuman Khandual <redacted> Signed-off-by: Kefeng Wang <redacted> --- .../features/vm/ioremap_prot/arch-support.txt | 2 +- arch/arm64/Kconfig | 1 + arch/arm64/include/asm/pgtable.h | 10 ++++++++++ arch/arm64/mm/hugetlbpage.c | 10 ---------- 4 files changed, 12 insertions(+), 11 deletions(-)
diff --git a/Documentation/features/vm/ioremap_prot/arch-support.txt b/Documentation/features/vm/ioremap_prot/arch-support.txt
index 205a90e82050..a710bd99c32e 100644
--- a/Documentation/features/vm/ioremap_prot/arch-support.txt
+++ b/Documentation/features/vm/ioremap_prot/arch-support.txt@@ -9,7 +9,7 @@ | alpha: | TODO | | arc: | ok | | arm: | TODO | - | arm64: | TODO | + | arm64: | ok | | csky: | TODO | | hexagon: | TODO | | ia64: | TODO |
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index ac160aa26126..1267f325d32b 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig@@ -189,6 +189,7 @@ config ARM64 select HAVE_FUNCTION_GRAPH_TRACER select HAVE_GCC_PLUGINS select HAVE_HW_BREAKPOINT if PERF_EVENTS + select HAVE_IOREMAP_PROT select HAVE_IRQ_TIME_ACCOUNTING select HAVE_KVM select HAVE_NMI
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 0b6632f18364..5a2eb6232e69 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h@@ -427,6 +427,16 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte) return clear_pte_bit(pte, __pgprot(PTE_SWP_EXCLUSIVE)); } +/* + * Select all bits except the pfn + */ +static inline pgprot_t pte_pgprot(pte_t pte) +{ + unsigned long pfn = pte_pfn(pte); + + return __pgprot(pte_val(pfn_pte(pfn, __pgprot(0))) ^ pte_val(pte)); +} + #ifdef CONFIG_NUMA_BALANCING /* * See the comment in include/linux/pgtable.h
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index e2a5ec9fdc0d..8eab05367549 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c@@ -100,16 +100,6 @@ int pud_huge(pud_t pud) #endif } -/* - * Select all bits except the pfn - */ -static inline pgprot_t pte_pgprot(pte_t pte) -{ - unsigned long pfn = pte_pfn(pte); - - return __pgprot(pte_val(pfn_pte(pfn, __pgprot(0))) ^ pte_val(pte)); -} - static int find_num_contig(struct mm_struct *mm, unsigned long addr, pte_t *ptep, size_t *pgsize) {
--
2.35.3
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