[PATCH 18/19] mm/arm64: Support large pfn mappings

Peter Xu
2024-08-09T16:09:58Z

Support huge pfnmaps by using bit 56 (PTE_SPECIAL) for "special" on
pmds/puds. Provide the pmd/pud helpers to set/get special bit.

There's one more thing missing for arm64 which is the pxx_pgprot() for
pmd/pud. Add them too, which is mostly the same as the pte version by
dropping the pfn field. These helpers are essential to be used in the new
follow_pfnmap*() API to report valid pgprot_t results.

Note that arm64 doesn't yet support huge PUD yet, but it's still
straightforward to provide the pud helpers that we need altogether. Only
PMD helpers will make an immediate benefit until arm64 will support huge
PUDs first in general (e.g. in THPs).

Cc: linux-arm-kernel@lists.infradead.org
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Peter Xu <peterx@redhat.com>
---
arch/arm64/Kconfig | 1 +
arch/arm64/include/asm/pgtable.h | 29 +++++++++++++++++++++++++++++
2 files changed, 30 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index b3fc891f1544..5f026b95f309 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -99,6 +99,7 @@ config ARM64
select ARCH_SUPPORTS_NUMA_BALANCING
select ARCH_SUPPORTS_PAGE_TABLE_CHECK
select ARCH_SUPPORTS_PER_VMA_LOCK
+ select ARCH_SUPPORTS_HUGE_PFNMAP if TRANSPARENT_HUGEPAGE
select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
select ARCH_WANT_COMPAT_IPC_PARSE_VERSION if COMPAT
select ARCH_WANT_DEFAULT_BPF_JIT
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index b78cc4a6758b..2faecc033a19 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -578,6 +578,14 @@ static inline pmd_t pmd_mkdevmap(pmd_t pmd)
return pte_pmd(set_pte_bit(pmd_pte(pmd), __pgprot(PTE_DEVMAP)));
}

+#ifdef CONFIG_ARCH_SUPPORTS_PMD_PFNMAP
+#define pmd_special(pte) (!!((pmd_val(pte) & PTE_SPECIAL)))
+static inline pmd_t pmd_mkspecial(pmd_t pmd)
+{
+ return set_pmd_bit(pmd, __pgprot(PTE_SPECIAL));
+}
+#endif
+
#define __pmd_to_phys(pmd) __pte_to_phys(pmd_pte(pmd))
#define __phys_to_pmd_val(phys) __phys_to_pte_val(phys)
#define pmd_pfn(pmd) ((__pmd_to_phys(pmd) & PMD_MASK) >> PAGE_SHIFT)
@@ -595,6 +603,27 @@ static inline pmd_t pmd_mkdevmap(pmd_t pmd)
#define pud_pfn(pud) ((__pud_to_phys(pud) & PUD_MASK) >> PAGE_SHIFT)
#define pfn_pud(pfn,prot) __pud(__phys_to_pud_val((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))

+#ifdef CONFIG_ARCH_SUPPORTS_PUD_PFNMAP
+#define pud_special(pte) pte_special(pud_pte(pud))
+#define pud_mkspecial(pte) pte_pud(pte_mkspecial(pud_pte(pud)))
+#endif
+
+#define pmd_pgprot pmd_pgprot
+static inline pgprot_t pmd_pgprot(pmd_t pmd)
+{
+ unsigned long pfn = pmd_pfn(pmd);
+
+ return __pgprot(pmd_val(pfn_pmd(pfn, __pgprot(0))) ^ pmd_val(pmd));
+}
+
+#define pud_pgprot pud_pgprot
+static inline pgprot_t pud_pgprot(pud_t pud)
+{
+ unsigned long pfn = pud_pfn(pud);
+
+ return __pgprot(pud_val(pfn_pud(pfn, __pgprot(0))) ^ pud_val(pud));
+}
+
static inline void __set_pte_at(struct mm_struct *mm,
unsigned long __always_unused addr,
pte_t *ptep, pte_t pte, unsigned int nr)
--
2.45.0