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Thu, 27 Nov 2025 06:12:53 -0800 (PST) Received: from J9GPGXL7NT.bytedance.net ([61.213.176.58]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3477b7341d2sm2030249a91.11.2025.11.27.06.12.48 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 27 Nov 2025 06:12:53 -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 9/9] riscv: mm: Clear mm_cpumask during local_flush_tlb_all() Date: Thu, 27 Nov 2025 22:11:17 +0800 Message-ID: <20251127141117.87420-10-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" Now that we maintain an array of active mms on each CPU, when local_flush_tlb_all() is called, we can clear current CPU in the mm_cpumask of all active mms on current CPU. Signed-off-by: Xu Lu --- arch/riscv/include/asm/tlbflush.h | 6 ++++++ arch/riscv/mm/context.c | 2 +- arch/riscv/mm/tlbflush.c | 31 +++++++++++++++++++++++++++++-- 3 files changed, 36 insertions(+), 3 deletions(-) diff --git a/arch/riscv/include/asm/tlbflush.h b/arch/riscv/include/asm/tlb= flush.h index c9630267c58cd..fd62b27172d4a 100644 --- a/arch/riscv/include/asm/tlbflush.h +++ b/arch/riscv/include/asm/tlbflush.h @@ -108,6 +108,7 @@ DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_info, tlbinfo= ); =20 void local_load_tlb_mm(struct mm_struct *mm); void local_flush_tlb_mm(struct mm_struct *mm); +void local_flush_tlb_all_mm(void); void __init lazy_tlb_flush_init(void); =20 #else /* CONFIG_RISCV_LAZY_TLB_FLUSH */ @@ -119,6 +120,11 @@ static inline void local_flush_tlb_mm(struct mm_struct= *mm) local_flush_tlb_all_asid(get_mm_asid(mm)); } =20 +static inline void local_flush_tlb_all_mm(void) +{ + local_flush_tlb_all(); +} + static inline void lazy_tlb_flush_init(void) {} =20 #endif /* CONFIG_RISCV_LAZY_TLB_FLUSH */ diff --git a/arch/riscv/mm/context.c b/arch/riscv/mm/context.c index c381c4ed46bfb..b6657681948f9 100644 --- a/arch/riscv/mm/context.c +++ b/arch/riscv/mm/context.c @@ -194,7 +194,7 @@ static void set_mm_asid(struct mm_struct *mm, unsigned = int cpu) satp_mode); =20 if (need_flush_tlb) - local_flush_tlb_all(); + local_flush_tlb_all_mm(); } =20 static void set_mm_noasid(struct mm_struct *mm) diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c index 88a1e45bcf508..73c0a7ef61cb1 100644 --- a/arch/riscv/mm/tlbflush.c +++ b/arch/riscv/mm/tlbflush.c @@ -89,13 +89,13 @@ void local_flush_tlb_kernel_range(unsigned long start, = unsigned long end) =20 static void __ipi_flush_tlb_all(void *info) { - local_flush_tlb_all(); + local_flush_tlb_all_mm(); } =20 void flush_tlb_all(void) { if (num_online_cpus() < 2) - local_flush_tlb_all(); + local_flush_tlb_all_mm(); else if (riscv_use_sbi_for_rfence()) sbi_remote_sfence_vma_asid(NULL, 0, FLUSH_TLB_MAX_SIZE, FLUSH_TLB_NO_ASI= D); else @@ -461,6 +461,33 @@ void local_flush_tlb_mm(struct mm_struct *mm) local_flush_tlb_all_asid(asid); } =20 +void local_flush_tlb_all_mm(void) +{ + struct tlb_info *info =3D this_cpu_ptr(&tlbinfo); + struct tlb_context *contexts =3D info->contexts; + struct mm_struct *mms[MAX_LOADED_MM]; + unsigned int cpu =3D raw_smp_processor_id(); + unsigned int i, num =3D 0; + + write_lock(&info->rwlock); + for (i =3D 0; i < MAX_LOADED_MM; i++) { + if (!contexts[i].mm || contexts[i].mm =3D=3D info->active_mm) + continue; + + mms[num++] =3D contexts[i].mm; + contexts[i].mm =3D NULL; + contexts[i].gen =3D 0; + } + write_unlock(&info->rwlock); + + for (i =3D 0; i < num; i++) { + cpumask_clear_cpu(cpu, mm_cpumask(mms[i])); + mmdrop_lazy_mm(mms[i]); + } + + local_flush_tlb_all(); +} + void __init lazy_tlb_flush_init(void) { struct tlb_flush_queue *queue; --=20 2.20.1