1 files changed, 101 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/tlb.h b/arch/arm64/include/asm/tlb.h
new file mode 100644
index 000000000..c995d1f45
--- /dev/null
+++ b/arch/arm64/include/asm/tlb.h
@@ -0,0 +1,101 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Based on arch/arm/include/asm/tlb.h
+ *
+ * Copyright (C) 2002 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ */
+#ifndef __ASM_TLB_H
+#define __ASM_TLB_H
+
+#include <linux/pagemap.h>
+#include <linux/swap.h>
+
+static inline void __tlb_remove_table(void *_table)
+{
+	free_page_and_swap_cache((struct page *)_table);
+}
+
+#define tlb_flush tlb_flush
+static void tlb_flush(struct mmu_gather *tlb);
+
+#include <asm-generic/tlb.h>
+
+/*
+ * get the tlbi levels in arm64.  Default value is 0 if more than one
+ * of cleared_* is set or neither is set.
+ * Arm64 doesn't support p4ds now.
+ */
+static inline int tlb_get_level(struct mmu_gather *tlb)
+{
+	/* The TTL field is only valid for the leaf entry. */
+	if (tlb->freed_tables)
+		return 0;
+
+	if (tlb->cleared_ptes && !(tlb->cleared_pmds ||
+				   tlb->cleared_puds ||
+				   tlb->cleared_p4ds))
+		return 3;
+
+	if (tlb->cleared_pmds && !(tlb->cleared_ptes ||
+				   tlb->cleared_puds ||
+				   tlb->cleared_p4ds))
+		return 2;
+
+	if (tlb->cleared_puds && !(tlb->cleared_ptes ||
+				   tlb->cleared_pmds ||
+				   tlb->cleared_p4ds))
+		return 1;
+
+	return 0;
+}
+
+static inline void tlb_flush(struct mmu_gather *tlb)
+{
+	struct vm_area_struct vma = TLB_FLUSH_VMA(tlb->mm, 0);
+	bool last_level = !tlb->freed_tables;
+	unsigned long stride = tlb_get_unmap_size(tlb);
+	int tlb_level = tlb_get_level(tlb);
+
+	/*
+	 * If we're tearing down the address space then we only care about
+	 * invalidating the walk-cache, since the ASID allocator won't
+	 * reallocate our ASID without invalidating the entire TLB.
+	 */
+	if (tlb->fullmm) {
+		if (!last_level)
+			flush_tlb_mm(tlb->mm);
+		return;
+	}
+
+	__flush_tlb_range(&vma, tlb->start, tlb->end, stride,
+			  last_level, tlb_level);
+}
+
+static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
+				  unsigned long addr)
+{
+	pgtable_pte_page_dtor(pte);
+	tlb_remove_table(tlb, pte);
+}
+
+#if CONFIG_PGTABLE_LEVELS > 2
+static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
+				  unsigned long addr)
+{
+	struct page *page = virt_to_page(pmdp);
+
+	pgtable_pmd_page_dtor(page);
+	tlb_remove_table(tlb, page);
+}
+#endif
+
+#if CONFIG_PGTABLE_LEVELS > 3
+static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pudp,
+				  unsigned long addr)
+{
+	tlb_remove_table(tlb, virt_to_page(pudp));
+}
+#endif
+
+#endif