[PATCH v2 2/3] riscv: mm: Apply Svinval in update_mmu_cache()

[Xu Lu]

Use Svinval in update_mmu_cache_range() when the extension is available.

Signed-off-by: Xu Lu <luxu.kernel at bytedance.com>
---
 arch/riscv/include/asm/pgtable.h  |  8 ++++++++
 arch/riscv/include/asm/tlbflush.h | 18 ++++++++++++++++++
 arch/riscv/mm/tlbflush.c          | 18 ------------------
 3 files changed, 26 insertions(+), 18 deletions(-)

diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 9926556099ae..823805cc465a 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -578,6 +578,14 @@ static inline void update_mmu_cache_range(struct vm_fault *vmf,
 	if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SVVPTC))
 		return;
 
+	if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SVINVAL)) {
+		local_sfence_w_inval();
+		while (nr--)
+			local_sinval_vma(address + nr * PAGE_SIZE, asid);
+		local_sfence_inval_ir();
+		return;
+	}
+
 	/*
 	 * The kernel assumes that TLBs don't cache invalid entries, but
 	 * in RISC-V, SFENCE.VMA specifies an ordering constraint, not a
diff --git a/arch/riscv/include/asm/tlbflush.h b/arch/riscv/include/asm/tlbflush.h
index 7c2cd5cc92d3..9636d07fe9ee 100644
--- a/arch/riscv/include/asm/tlbflush.h
+++ b/arch/riscv/include/asm/tlbflush.h
@@ -20,6 +20,24 @@ 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_sfence_inval_ir(void)
+{
+	asm volatile(SFENCE_INVAL_IR() ::: "memory");
+}
+
+static inline void local_sfence_w_inval(void)
+{
+	asm volatile(SFENCE_W_INVAL() ::: "memory");
+}
+
+static inline void local_sinval_vma(unsigned long vma, unsigned long asid)
+{
+	if (asid != FLUSH_TLB_NO_ASID)
+		asm volatile(SINVAL_VMA(%0, %1) : : "r" (vma), "r" (asid) : "memory");
+	else
+		asm volatile(SINVAL_VMA(%0, zero) : : "r" (vma) : "memory");
+}
+
 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 73c226f719c7..962db300a166 100644
--- a/arch/riscv/mm/tlbflush.c
+++ b/arch/riscv/mm/tlbflush.c
@@ -11,24 +11,6 @@
 
 #define has_svinval()	riscv_has_extension_unlikely(RISCV_ISA_EXT_SVINVAL)
 
-static inline void local_sfence_inval_ir(void)
-{
-	asm volatile(SFENCE_INVAL_IR() ::: "memory");
-}
-
-static inline void local_sfence_w_inval(void)
-{
-	asm volatile(SFENCE_W_INVAL() ::: "memory");
-}
-
-static inline void local_sinval_vma(unsigned long vma, unsigned long asid)
-{
-	if (asid != FLUSH_TLB_NO_ASID)
-		asm volatile(SINVAL_VMA(%0, %1) : : "r" (vma), "r" (asid) : "memory");
-	else
-		asm volatile(SINVAL_VMA(%0, zero) : : "r" (vma) : "memory");
-}
-
 /*
  * Flush entire TLB if number of entries to be flushed is greater
  * than the threshold below.
-- 
2.39.5