linux-kernel - [PATCH -next 3/4] riscv: mm: add param stride for __sbi_tlb_flush

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Message-ID: <20210430082850.462609-4-sunnanyong@huawei.com>
Date:   Fri, 30 Apr 2021 16:28:49 +0800
From:   Nanyong Sun <sunnanyong@...wei.com>
To:     <paul.walmsley@...ive.com>, <palmer@...belt.com>,
        <aou@...s.berkeley.edu>
CC:     <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <palmerdabbelt@...gle.com>, <atish.patra@....com>,
        <wangkefeng.wang@...wei.com>, <sunnanyong@...wei.com>
Subject: [PATCH -next 3/4] riscv: mm: add param stride for __sbi_tlb_flush_range

Add a parameter: stride for __sbi_tlb_flush_range(),
represent the page stride between the address of start and end.
Normally, the stride is PAGE_SIZE, and when flush huge page
address, the stride can be the huge page size such as:PMD_SIZE,
then it only need to flush one tlb entry if the address range
within PMD_SIZE.

Signed-off-by: Nanyong Sun <sunnanyong@...wei.com>
---
 arch/riscv/mm/tlbflush.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c
index 720b443c4..382781abf 100644
--- a/arch/riscv/mm/tlbflush.c
+++ b/arch/riscv/mm/tlbflush.c
@@ -15,7 +15,7 @@ void flush_tlb_all(void)
  * Kernel may panic if cmask is NULL.
  */
 static void __sbi_tlb_flush_range(struct cpumask *cmask, unsigned long start,
-				  unsigned long size)
+				  unsigned long size, unsigned long stride)
 {
 	struct cpumask hmask;
 	unsigned int cpuid;
@@ -27,7 +27,7 @@ static void __sbi_tlb_flush_range(struct cpumask *cmask, unsigned long start,
 
 	if (cpumask_any_but(cmask, cpuid) >= nr_cpu_ids) {
 		/* local cpu is the only cpu present in cpumask */
-		if (size <= PAGE_SIZE)
+		if (size <= stride)
 			local_flush_tlb_page(start);
 		else
 			local_flush_tlb_all();
@@ -41,16 +41,16 @@ static void __sbi_tlb_flush_range(struct cpumask *cmask, unsigned long start,
 
 void flush_tlb_mm(struct mm_struct *mm)
 {
-	__sbi_tlb_flush_range(mm_cpumask(mm), 0, -1);
+	__sbi_tlb_flush_range(mm_cpumask(mm), 0, -1, PAGE_SIZE);
 }
 
 void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
 {
-	__sbi_tlb_flush_range(mm_cpumask(vma->vm_mm), addr, PAGE_SIZE);
+	__sbi_tlb_flush_range(mm_cpumask(vma->vm_mm), addr, PAGE_SIZE, PAGE_SIZE);
 }
 
 void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
 		     unsigned long end)
 {
-	__sbi_tlb_flush_range(mm_cpumask(vma->vm_mm), start, end - start);
+	__sbi_tlb_flush_range(mm_cpumask(vma->vm_mm), start, end - start, PAGE_SIZE);
 }
-- 
2.25.1