From nobody Tue Feb 10 02:59:02 2026 Received: from mail-ej1-f74.google.com (mail-ej1-f74.google.com [209.85.218.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9031A3B8BD3 for ; Thu, 15 Jan 2026 15:59:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768492792; cv=none; b=HOT3Is+Y9qKA7YzGF6mlWvwgUS3iwTMP7vaPiiIS6yDYlAMdyRXbeD4Zecfsld0PdGt5uVXhgPHe8rNrmIvBcP7jvuJqw/WJ90cKNbo+iJNr2MZGuCai3oMIQkG6m4KDtIFU+AjRepxnX3jI6dfGSuktKp0JrMOuUdnWxxVkuQ8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768492792; c=relaxed/simple; bh=opub2fbgRWS1Kq2hoaD2U8sWGb/uPCW68VZXw0xO7sk=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=QgljG31Gshu9ESf9UIo1bfM2rZR+JrewcPXt82d+7mZy5EjP0PdJ723AomJqQaxu5MFcjcCzKc204zW5SyOzjF3ARyho+PcA+RdTStq3HI4NM7o8V8PA/W4/wFCOSzQwbia79zSMgLQhZkYQciV2CskMg1PMsDHNYIAah/Mex1Y= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--lrizzo.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=m8Pm6clF; arc=none smtp.client-ip=209.85.218.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--lrizzo.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="m8Pm6clF" Received: by mail-ej1-f74.google.com with SMTP id a640c23a62f3a-b8709d4ff20so113140566b.0 for ; Thu, 15 Jan 2026 07:59:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1768492789; x=1769097589; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=K3MNKafNCuEMF2IMwQI0I3Gp+X1QzwdfJu03oHxNqEQ=; b=m8Pm6clF1xp5xqEeYwswu9GMtcAJxC075mXTiEc5UNrV/PxR5wtNSLS/DL6jHiyEGo UC82o1FXsX9G+9SlmjuZTxQXAIiuiUfp0kVPG4eVezeW66U3UsWutFvM5fT3M9+YC+D9 sqMl2oncDu7N1IJszZkz1zAa4q8+upR73YSMS8ASTb/i4c/068eHFxwp56iDvBQvJBor MKygt9Nf8537p2yjCF0T77f+LMi7yhDb4CnbNqvvfOPD9fHzzv56MNi4T+66e4WF9ehB 5DbdGn3OhgUx/8n4hAsrr4GXTw3Rh2mq4e6AxXOLbZupuKPxxR2PBJHU7JixJeJWCHFq lCBQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1768492789; x=1769097589; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=K3MNKafNCuEMF2IMwQI0I3Gp+X1QzwdfJu03oHxNqEQ=; b=uyLOFSYpIxyTGY8lszJ4iuGu4cEd+ySoBYGOrJ9dsGPvlk3oaYA8AfdEtPbAwL2z3H EllZ8F5bqiA5AFk+eGgVpuH5XH5evLAFS1AT0RjB2/6zwgGz1cnvzXTuSducx54Ho+6m Cxl3VZM5dZwKwklm1cP5WITREvOUKTDkGwd59sIeEH5BspOqTbv6ltSKsFlqoqs0GqCa 2x/O3/GPzcb+LrC8afLPOCZFdiZW2hDhTIx5kYzKZ6rzAHRq8tzaNc6juSm4ejtzfDPp QJZCjG8l0yna3E8+KlB86Z2whQtYk7gNhi9cs5VWbqxHjjJQ6HOuREp8JifU+ZHOVMM4 kCsA== X-Gm-Message-State: AOJu0Yx46Hr9TWMrhK+ZTsdUuJZ3Gevj6RpSCTRofMSZqMorvb+AdBD6 o2CJBQ+I2Hr8t0uYe6FQB7iuRr9Ks0oDlmgpNWuS6keyhD8QkPcigwu62ijfuIHfvP6lTQYEtxP nlZm3Jw== X-Received: from ejux23.prod.google.com ([2002:a17:906:4a97:b0:b84:5221:bb89]) (user=lrizzo job=prod-delivery.src-stubby-dispatcher) by 2002:a17:907:9608:b0:b87:4c74:b316 with SMTP id a640c23a62f3a-b8792feb24dmr6764966b.50.1768492788925; Thu, 15 Jan 2026 07:59:48 -0800 (PST) Date: Thu, 15 Jan 2026 15:59:40 +0000 In-Reply-To: <20260115155942.482137-1-lrizzo@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260115155942.482137-1-lrizzo@google.com> X-Mailer: git-send-email 2.52.0.457.g6b5491de43-goog Message-ID: <20260115155942.482137-2-lrizzo@google.com> Subject: [PATCH v4 1/3] genirq: Add flags for software interrupt moderation. From: Luigi Rizzo To: Thomas Gleixner , Marc Zyngier , Luigi Rizzo , Paolo Abeni , Andrew Morton , Sean Christopherson , Jacob Pan Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, Bjorn Helgaas , Willem de Bruijn , Luigi Rizzo Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add two flags to support software interrupt moderation: - IRQ_SW_MODERATION is an irqdesc flag indicating that an interrupt supports moderation. This is a feature that can be set by the system administrator. - IRQD_IRQ_MODERATED is an internal irqdata flag indicating that the interrupt is currently being moderated. This is a state flag. Signed-off-by: Luigi Rizzo --- include/linux/irq.h | 6 +++++- kernel/irq/settings.h | 7 +++++++ 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/include/linux/irq.h b/include/linux/irq.h index 4a9f1d7b08c39..df653e10a83bf 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -72,6 +72,7 @@ enum irqchip_irq_state; * IRQ_DISABLE_UNLAZY - Disable lazy irq disable * IRQ_HIDDEN - Don't show up in /proc/interrupts * IRQ_NO_DEBUG - Exclude from note_interrupt() debugging + * IRQ_SW_MODERATION - Can do software interrupt moderation */ enum { IRQ_TYPE_NONE =3D 0x00000000, @@ -99,13 +100,14 @@ enum { IRQ_DISABLE_UNLAZY =3D (1 << 19), IRQ_HIDDEN =3D (1 << 20), IRQ_NO_DEBUG =3D (1 << 21), + IRQ_SW_MODERATION =3D (1 << 22), }; =20 #define IRQF_MODIFY_MASK \ (IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \ IRQ_NOAUTOEN | IRQ_LEVEL | IRQ_NO_BALANCING | \ IRQ_PER_CPU | IRQ_NESTED_THREAD | IRQ_NOTHREAD | IRQ_PER_CPU_DEVID | \ - IRQ_IS_POLLED | IRQ_DISABLE_UNLAZY | IRQ_HIDDEN) + IRQ_IS_POLLED | IRQ_DISABLE_UNLAZY | IRQ_HIDDEN | IRQ_SW_MODERATION) =20 #define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING) =20 @@ -219,6 +221,7 @@ struct irq_data { * irqchip have flag IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND set. * IRQD_RESEND_WHEN_IN_PROGRESS - Interrupt may fire when already in progr= ess in which * case it must be resent at the next available opportunity. + * IRQD_IRQ_MODERATED - Interrupt is currently moderated. */ enum { IRQD_TRIGGER_MASK =3D 0xf, @@ -244,6 +247,7 @@ enum { IRQD_AFFINITY_ON_ACTIVATE =3D BIT(28), IRQD_IRQ_ENABLED_ON_SUSPEND =3D BIT(29), IRQD_RESEND_WHEN_IN_PROGRESS =3D BIT(30), + IRQD_IRQ_MODERATED =3D BIT(31), }; =20 #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors) diff --git a/kernel/irq/settings.h b/kernel/irq/settings.h index 00b3bd127692c..bc8ade4726322 100644 --- a/kernel/irq/settings.h +++ b/kernel/irq/settings.h @@ -18,6 +18,7 @@ enum { _IRQ_DISABLE_UNLAZY =3D IRQ_DISABLE_UNLAZY, _IRQ_HIDDEN =3D IRQ_HIDDEN, _IRQ_NO_DEBUG =3D IRQ_NO_DEBUG, + _IRQ_SW_MODERATION =3D IRQ_SW_MODERATION, _IRQF_MODIFY_MASK =3D IRQF_MODIFY_MASK, }; =20 @@ -34,6 +35,7 @@ enum { #define IRQ_DISABLE_UNLAZY GOT_YOU_MORON #define IRQ_HIDDEN GOT_YOU_MORON #define IRQ_NO_DEBUG GOT_YOU_MORON +#define IRQ_SW_MODERATION GOT_YOU_MORON #undef IRQF_MODIFY_MASK #define IRQF_MODIFY_MASK GOT_YOU_MORON =20 @@ -180,3 +182,8 @@ static inline bool irq_settings_no_debug(struct irq_des= c *desc) { return desc->status_use_accessors & _IRQ_NO_DEBUG; } + +static inline bool irq_settings_moderation_allowed(struct irq_desc *desc) +{ + return desc->status_use_accessors & _IRQ_SW_MODERATION; +} --=20 2.52.0.457.g6b5491de43-goog