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[92.145.124.62]) by smtp.gmail.com with ESMTPSA id p8-20020adfe608000000b003141f3843e6sm1489099wrm.90.2023.07.11.00.56.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 Jul 2023 00:56:39 -0700 (PDT) From: Alexandre Ghiti To: Will Deacon , "Aneesh Kumar K . V" , Andrew Morton , Nick Piggin , Peter Zijlstra , Mayuresh Chitale , Vincent Chen , Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Alexandre Ghiti Subject: [PATCH 2/4] riscv: Improve flush_tlb_range() for hugetlb pages Date: Tue, 11 Jul 2023 09:54:32 +0200 Message-Id: <20230711075434.10936-3-alexghiti@rivosinc.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230711075434.10936-1-alexghiti@rivosinc.com> References: <20230711075434.10936-1-alexghiti@rivosinc.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" flush_tlb_range() uses a fixed stride of PAGE_SIZE and in its current form, when a hugetlb mapping needs to be flushed, flush_tlb_range() flushes the whole tlb: so set a stride of the size of the hugetlb mapping in order to only flush the hugetlb mapping. Note that THPs are directly handled by flush_pmd_tlb_range(). Signed-off-by: Alexandre Ghiti --- arch/riscv/mm/tlbflush.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c index fa03289853d8..3e4acef1f6bc 100644 --- a/arch/riscv/mm/tlbflush.c +++ b/arch/riscv/mm/tlbflush.c @@ -3,6 +3,7 @@ #include #include #include +#include #include #include =20 @@ -147,7 +148,14 @@ void flush_tlb_page(struct vm_area_struct *vma, unsign= ed long addr) void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) { - __flush_tlb_range(vma->vm_mm, start, end - start, PAGE_SIZE); + unsigned long stride_shift; + + stride_shift =3D is_vm_hugetlb_page(vma) ? + huge_page_shift(hstate_vma(vma)) : + PAGE_SHIFT; + + __flush_tlb_range(vma->vm_mm, + start, end - start, 1 << stride_shift); } #ifdef CONFIG_TRANSPARENT_HUGEPAGE void flush_pmd_tlb_range(struct vm_area_struct *vma, unsigned long start, --=20 2.39.2