[PATCH v2 1/3] riscv: mm: Use ASID in update_mmu_cache()

[Xu Lu]

Only flush TLB entries for the specified mm in update_mmu_cache_range().

Signed-off-by: Xu Lu <luxu.kernel at bytedance.com>
---
 arch/riscv/include/asm/pgtable.h  | 4 +++-
 arch/riscv/include/asm/tlbflush.h | 5 +++++
 arch/riscv/mm/tlbflush.c          | 5 -----
 3 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 5d5756bda82e..9926556099ae 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -568,6 +568,8 @@ static inline void update_mmu_cache_range(struct vm_fault *vmf,
 		struct vm_area_struct *vma, unsigned long address,
 		pte_t *ptep, unsigned int nr)
 {
+	unsigned long asid = get_mm_asid(vma->vm_mm);
+
 	/*
 	 * Svvptc guarantees that the new valid pte will be visible within
 	 * a bounded timeframe, so when the uarch does not cache invalid
@@ -584,7 +586,7 @@ static inline void update_mmu_cache_range(struct vm_fault *vmf,
 	 * the extra traps reduce performance.  So, eagerly SFENCE.VMA.
 	 */
 	while (nr--)
-		local_flush_tlb_page(address + nr * PAGE_SIZE);
+		local_flush_tlb_page_asid(address + nr * PAGE_SIZE, asid);
 
 }
 #define update_mmu_cache(vma, addr, ptep) \
diff --git a/arch/riscv/include/asm/tlbflush.h b/arch/riscv/include/asm/tlbflush.h
index eed0abc40514..7c2cd5cc92d3 100644
--- a/arch/riscv/include/asm/tlbflush.h
+++ b/arch/riscv/include/asm/tlbflush.h
@@ -15,6 +15,11 @@
 #define FLUSH_TLB_NO_ASID       ((unsigned long)-1)
 
 #ifdef CONFIG_MMU
+static inline unsigned long get_mm_asid(struct mm_struct *mm)
+{
+	return mm ? cntx2asid(atomic_long_read(&mm->context.id)) : FLUSH_TLB_NO_ASID;
+}
+
 static inline void local_flush_tlb_all(void)
 {
 	__asm__ __volatile__ ("sfence.vma" : : : "memory");
diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c
index 8404530ec00f..73c226f719c7 100644
--- a/arch/riscv/mm/tlbflush.c
+++ b/arch/riscv/mm/tlbflush.c
@@ -110,11 +110,6 @@ static void __ipi_flush_tlb_range_asid(void *info)
 	local_flush_tlb_range_asid(d->start, d->size, d->stride, d->asid);
 }
 
-static inline unsigned long get_mm_asid(struct mm_struct *mm)
-{
-	return mm ? cntx2asid(atomic_long_read(&mm->context.id)) : FLUSH_TLB_NO_ASID;
-}
-
 static void __flush_tlb_range(struct mm_struct *mm,
 			      const struct cpumask *cmask,
 			      unsigned long start, unsigned long size,
-- 
2.39.5