From nobody Tue Dec 16 11:45:11 2025 Received: from shelob.surriel.com (shelob.surriel.com [96.67.55.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E73C14A3C4B for ; Tue, 6 May 2025 00:48:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=96.67.55.147 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746492506; cv=none; b=Gdy6DRt4Rl2Mwqz+x9bJplUfeJVRKJoU/KOG6XMYYvBScLDAvFo2oCN+RTV8dUYn5feRZklmqpzLyvL9RV97FIjKJzsrwys4SiEm9NKdi/DGRTvdzejjCProv4D0IDOeKlW7que1hMuV0JlE4QjeK6MZVtDnPqrfGdHXoXNfF0c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746492506; c=relaxed/simple; bh=8Rv2NThq3GpIF740ywbYkJK48AvMiLVuweYORk9NC8U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=TFNI2Li46iOZvAH++jS5vzTkwbfDm2jNoMEd1hXGpR6nm35VV0amTPtQeqQilDHO9l8hy7mfpg8VPXLszENSUX1zN+3I37wIMWzTM3HReZXZ76cJXdkxg+VKsoY6Hurv7ExPGSw6RwPjgQjqpUBABa1QP+OYi0miumLotVWkf0k= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=surriel.com; spf=pass smtp.mailfrom=shelob.surriel.com; arc=none smtp.client-ip=96.67.55.147 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=surriel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=shelob.surriel.com Received: from fangorn.home.surriel.com ([10.0.13.7]) by shelob.surriel.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.97.1) (envelope-from ) id 1uC6K6-000000000IF-3gGA; Mon, 05 May 2025 20:38:14 -0400 From: Rik van Riel To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, x86@kernel.org, kernel-team@meta.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, Rik van Riel , Yu-cheng Yu , Rik van Riel Subject: [RFC PATCH 6/9] x86/apic: Introduce Remote Action Request Operations Date: Mon, 5 May 2025 20:37:44 -0400 Message-ID: <20250506003811.92405-7-riel@surriel.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250506003811.92405-1-riel@surriel.com> References: <20250506003811.92405-1-riel@surriel.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 Sender: riel@surriel.com Content-Type: text/plain; charset="utf-8" From: Rik van Riel RAR TLB flushing is started by sending a command to the APIC. This patch adds Remote Action Request commands. [riel: move some things around to acount for 6 years of changes] Signed-off-by: Yu-cheng Yu Signed-off-by: Rik van Riel --- arch/x86/include/asm/apicdef.h | 1 + arch/x86/include/asm/irq_vectors.h | 5 +++++ arch/x86/include/asm/smp.h | 15 +++++++++++++++ arch/x86/kernel/apic/ipi.c | 23 +++++++++++++++++++---- arch/x86/kernel/apic/local.h | 3 +++ arch/x86/kernel/smp.c | 3 +++ 6 files changed, 46 insertions(+), 4 deletions(-) diff --git a/arch/x86/include/asm/apicdef.h b/arch/x86/include/asm/apicdef.h index 094106b6a538..b152d45af91a 100644 --- a/arch/x86/include/asm/apicdef.h +++ b/arch/x86/include/asm/apicdef.h @@ -92,6 +92,7 @@ #define APIC_DM_LOWEST 0x00100 #define APIC_DM_SMI 0x00200 #define APIC_DM_REMRD 0x00300 +#define APIC_DM_RAR 0x00300 #define APIC_DM_NMI 0x00400 #define APIC_DM_INIT 0x00500 #define APIC_DM_STARTUP 0x00600 diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_= vectors.h index 47051871b436..c417b0015304 100644 --- a/arch/x86/include/asm/irq_vectors.h +++ b/arch/x86/include/asm/irq_vectors.h @@ -103,6 +103,11 @@ */ #define POSTED_MSI_NOTIFICATION_VECTOR 0xeb =20 +/* + * RAR (remote action request) TLB flush + */ +#define RAR_VECTOR 0xe0 + #define NR_VECTORS 256 =20 #ifdef CONFIG_X86_LOCAL_APIC diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h index 0c1c68039d6f..1ab9f5fcac8a 100644 --- a/arch/x86/include/asm/smp.h +++ b/arch/x86/include/asm/smp.h @@ -40,6 +40,9 @@ struct smp_ops { =20 void (*send_call_func_ipi)(const struct cpumask *mask); void (*send_call_func_single_ipi)(int cpu); + + void (*send_rar_ipi)(const struct cpumask *mask); + void (*send_rar_single_ipi)(int cpu); }; =20 /* Globals due to paravirt */ @@ -100,6 +103,16 @@ static inline void arch_send_call_function_ipi_mask(co= nst struct cpumask *mask) smp_ops.send_call_func_ipi(mask); } =20 +static inline void arch_send_rar_single_ipi(int cpu) +{ + smp_ops.send_rar_single_ipi(cpu); +} + +static inline void arch_send_rar_ipi_mask(const struct cpumask *mask) +{ + smp_ops.send_rar_ipi(mask); +} + void cpu_disable_common(void); void native_smp_prepare_boot_cpu(void); void smp_prepare_cpus_common(void); @@ -120,6 +133,8 @@ void __noreturn mwait_play_dead(unsigned int eax_hint); void native_smp_send_reschedule(int cpu); void native_send_call_func_ipi(const struct cpumask *mask); void native_send_call_func_single_ipi(int cpu); +void native_send_rar_ipi(const struct cpumask *mask); +void native_send_rar_single_ipi(int cpu); =20 asmlinkage __visible void smp_reboot_interrupt(void); __visible void smp_reschedule_interrupt(struct pt_regs *regs); diff --git a/arch/x86/kernel/apic/ipi.c b/arch/x86/kernel/apic/ipi.c index 98a57cb4aa86..e5e9fc08f86c 100644 --- a/arch/x86/kernel/apic/ipi.c +++ b/arch/x86/kernel/apic/ipi.c @@ -79,7 +79,7 @@ void native_send_call_func_single_ipi(int cpu) __apic_send_IPI(cpu, CALL_FUNCTION_SINGLE_VECTOR); } =20 -void native_send_call_func_ipi(const struct cpumask *mask) +static void do_native_send_ipi(const struct cpumask *mask, int vector) { if (static_branch_likely(&apic_use_ipi_shorthand)) { unsigned int cpu =3D smp_processor_id(); @@ -88,14 +88,19 @@ void native_send_call_func_ipi(const struct cpumask *ma= sk) goto sendmask; =20 if (cpumask_test_cpu(cpu, mask)) - __apic_send_IPI_all(CALL_FUNCTION_VECTOR); + __apic_send_IPI_all(vector); else if (num_online_cpus() > 1) - __apic_send_IPI_allbutself(CALL_FUNCTION_VECTOR); + __apic_send_IPI_allbutself(vector); return; } =20 sendmask: - __apic_send_IPI_mask(mask, CALL_FUNCTION_VECTOR); + __apic_send_IPI_mask(mask, vector); +} + +void native_send_call_func_ipi(const struct cpumask *mask) +{ + do_native_send_ipi(mask, CALL_FUNCTION_VECTOR); } =20 void apic_send_nmi_to_offline_cpu(unsigned int cpu) @@ -106,6 +111,16 @@ void apic_send_nmi_to_offline_cpu(unsigned int cpu) return; apic->send_IPI(cpu, NMI_VECTOR); } + +void native_send_rar_single_ipi(int cpu) +{ + apic->send_IPI_mask(cpumask_of(cpu), RAR_VECTOR); +} + +void native_send_rar_ipi(const struct cpumask *mask) +{ + do_native_send_ipi(mask, RAR_VECTOR); +} #endif /* CONFIG_SMP */ =20 static inline int __prepare_ICR2(unsigned int mask) diff --git a/arch/x86/kernel/apic/local.h b/arch/x86/kernel/apic/local.h index bdcf609eb283..833669174267 100644 --- a/arch/x86/kernel/apic/local.h +++ b/arch/x86/kernel/apic/local.h @@ -38,6 +38,9 @@ static inline unsigned int __prepare_ICR(unsigned int sho= rtcut, int vector, case NMI_VECTOR: icr |=3D APIC_DM_NMI; break; + case RAR_VECTOR: + icr |=3D APIC_DM_RAR; + break; } return icr; } diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c index 18266cc3d98c..2c51ed6aaf03 100644 --- a/arch/x86/kernel/smp.c +++ b/arch/x86/kernel/smp.c @@ -297,5 +297,8 @@ struct smp_ops smp_ops =3D { =20 .send_call_func_ipi =3D native_send_call_func_ipi, .send_call_func_single_ipi =3D native_send_call_func_single_ipi, + + .send_rar_ipi =3D native_send_rar_ipi, + .send_rar_single_ipi =3D native_send_rar_single_ipi, }; EXPORT_SYMBOL_GPL(smp_ops); --=20 2.49.0