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[92.145.124.62]) by smtp.gmail.com with ESMTPSA id f19-20020a7bcc13000000b003fa973e6612sm12317248wmh.44.2023.07.11.00.55.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 Jul 2023 00:55:38 -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 1/4] riscv: Improve flush_tlb() Date: Tue, 11 Jul 2023 09:54:31 +0200 Message-Id: <20230711075434.10936-2-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" For now, flush_tlb() simply calls flush_tlb_mm() which results in a flush of the whole TLB. So let's use mmu_gather fields to provide a more fine-grained flush of the TLB. Signed-off-by: Alexandre Ghiti --- arch/riscv/include/asm/tlb.h | 6 +++++- arch/riscv/include/asm/tlbflush.h | 3 +++ arch/riscv/mm/tlbflush.c | 7 +++++++ 3 files changed, 15 insertions(+), 1 deletion(-) diff --git a/arch/riscv/include/asm/tlb.h b/arch/riscv/include/asm/tlb.h index 120bcf2ed8a8..3373dcf0f413 100644 --- a/arch/riscv/include/asm/tlb.h +++ b/arch/riscv/include/asm/tlb.h @@ -15,7 +15,11 @@ static void tlb_flush(struct mmu_gather *tlb); =20 static inline void tlb_flush(struct mmu_gather *tlb) { - flush_tlb_mm(tlb->mm); + if (tlb->fullmm || tlb->need_flush_all) + flush_tlb_mm(tlb->mm); + else + flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end, + tlb_get_unmap_size(tlb)); } =20 #endif /* _ASM_RISCV_TLB_H */ diff --git a/arch/riscv/include/asm/tlbflush.h b/arch/riscv/include/asm/tlb= flush.h index a09196f8de68..f5c4fb0ae642 100644 --- a/arch/riscv/include/asm/tlbflush.h +++ b/arch/riscv/include/asm/tlbflush.h @@ -32,6 +32,8 @@ static inline void local_flush_tlb_page(unsigned long add= r) #if defined(CONFIG_SMP) && defined(CONFIG_MMU) void flush_tlb_all(void); void flush_tlb_mm(struct mm_struct *mm); +void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, + unsigned long end, unsigned int page_size); void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr); void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); @@ -52,6 +54,7 @@ static inline void flush_tlb_range(struct vm_area_struct = *vma, } =20 #define flush_tlb_mm(mm) flush_tlb_all() +#define flush_tlb_mm_range(mm, start, end, page_size) flush_tlb_all() #endif /* !CONFIG_SMP || !CONFIG_MMU */ =20 /* Flush a range of kernel pages */ diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c index 77be59aadc73..fa03289853d8 100644 --- a/arch/riscv/mm/tlbflush.c +++ b/arch/riscv/mm/tlbflush.c @@ -132,6 +132,13 @@ void flush_tlb_mm(struct mm_struct *mm) __flush_tlb_range(mm, 0, -1, PAGE_SIZE); } =20 +void flush_tlb_mm_range(struct mm_struct *mm, + unsigned long start, unsigned long end, + unsigned int page_size) +{ + __flush_tlb_range(mm, start, end - start, page_size); +} + void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr) { __flush_tlb_range(vma->vm_mm, addr, PAGE_SIZE, PAGE_SIZE); --=20 2.39.2