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Thu, 27 Nov 2025 06:12:48 -0800 (PST) Received: from J9GPGXL7NT.bytedance.net ([61.213.176.58]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3477b7341d2sm2030249a91.11.2025.11.27.06.12.43 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 27 Nov 2025 06:12:47 -0800 (PST) From: Xu Lu To: pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, kees@kernel.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, akpm@linux-foundation.org, david@redhat.com, apatel@ventanamicro.com, guoren@kernel.org Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Xu Lu Subject: [RFC PATCH v2 8/9] riscv: mm: Clear mm_cpumask during local_flush_tlb_all_asid() Date: Thu, 27 Nov 2025 22:11:16 +0800 Message-ID: <20251127141117.87420-9-luxu.kernel@bytedance.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20251127141117.87420-1-luxu.kernel@bytedance.com> References: <20251127141117.87420-1-luxu.kernel@bytedance.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When local_flush_tlb_all_asid() is called, the target mm's TLB entries are all flushed out, then we can clear current CPU in its mm_cpumask so that next time the mm's memory mapping is modified, no IPI will be sent to current CPU. Signed-off-by: Xu Lu --- arch/riscv/mm/tlbflush.c | 32 +++++++++++++++++++------------- 1 file changed, 19 insertions(+), 13 deletions(-) diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c index 0083fac87c2bc..88a1e45bcf508 100644 --- a/arch/riscv/mm/tlbflush.c +++ b/arch/riscv/mm/tlbflush.c @@ -35,7 +35,8 @@ static inline void local_sinval_vma(unsigned long vma, un= signed long asid) */ unsigned long tlb_flush_all_threshold __read_mostly =3D 64; =20 -static void local_flush_tlb_range_threshold_asid(unsigned long start, +static void local_flush_tlb_range_threshold_asid(struct mm_struct *mm, + unsigned long start, unsigned long size, unsigned long stride, unsigned long asid) @@ -44,7 +45,7 @@ static void local_flush_tlb_range_threshold_asid(unsigned= long start, int i; =20 if (nr_ptes_in_range > tlb_flush_all_threshold) { - local_flush_tlb_all_asid(asid); + local_flush_tlb_mm(mm); return; } =20 @@ -64,21 +65,26 @@ static void local_flush_tlb_range_threshold_asid(unsign= ed long start, } } =20 -static inline void local_flush_tlb_range_asid(unsigned long start, - unsigned long size, unsigned long stride, unsigned long asid) +static inline void local_flush_tlb_range_asid(struct mm_struct *mm, + unsigned long start, + unsigned long size, + unsigned long stride, + unsigned long asid) { - if (size <=3D stride) + if (size <=3D stride) { local_flush_tlb_page_asid(start, asid); - else if (size =3D=3D FLUSH_TLB_MAX_SIZE) - local_flush_tlb_all_asid(asid); - else - local_flush_tlb_range_threshold_asid(start, size, stride, asid); + } else if (size =3D=3D FLUSH_TLB_MAX_SIZE) { + local_flush_tlb_mm(mm); + } else { + local_flush_tlb_range_threshold_asid(mm, start, size, stride, + asid); + } } =20 /* Flush a range of kernel pages without broadcasting */ void local_flush_tlb_kernel_range(unsigned long start, unsigned long end) { - local_flush_tlb_range_asid(start, end - start, PAGE_SIZE, FLUSH_TLB_NO_AS= ID); + local_flush_tlb_range_asid(NULL, start, end - start, PAGE_SIZE, FLUSH_TLB= _NO_ASID); } =20 static void __ipi_flush_tlb_all(void *info) @@ -204,7 +210,7 @@ static void __ipi_flush_tlb_range_asid(void *info) { struct flush_tlb_range_data *d =3D info; =20 - local_flush_tlb_range_asid(d->start, d->size, d->stride, d->asid); + local_flush_tlb_range_asid(d->mm, d->start, d->size, d->stride, d->asid); } =20 static void __flush_tlb_range(struct mm_struct *mm, @@ -222,7 +228,7 @@ static void __flush_tlb_range(struct mm_struct *mm, =20 /* Check if the TLB flush needs to be sent to other CPUs. */ if (cpumask_any_but(cmask, cpu) >=3D nr_cpu_ids) { - local_flush_tlb_range_asid(start, size, stride, asid); + local_flush_tlb_range_asid(mm, start, size, stride, asid); } else if (riscv_use_sbi_for_rfence()) { sbi_remote_sfence_vma_asid(cmask, start, size, asid); } else { @@ -410,7 +416,7 @@ void local_load_tlb_mm(struct mm_struct *mm) start =3D queue->tasks[i].start; size =3D queue->tasks[i].size; stride =3D queue->tasks[i].stride; - local_flush_tlb_range_asid(start, size, + local_flush_tlb_range_asid(mm, start, size, stride, asid); } } --=20 2.20.1