From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 34A37C11F66 for ; Tue, 29 Jun 2021 13:17:59 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id EBEEE61D5D for ; Tue, 29 Jun 2021 13:17:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EBEEE61D5D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=TK9VCQqQaSzcAf606vggdvTO4J9gLNzMGXnobC1gGl4=; b=TZdT3rKXWn2Pq8 k4DhwZdaLQImw0ZWFCjXWCtDs4/xxXgJOOPHC8J9HKoM4P/AJagOYzbIej7zSfUsAS3ul03G+fy0s PYpDKYDmKAHfMokOcggFvZxNRsM/6MxFOwNHksd0QwG99rCmxnhIzaexK2lnaeGPlqTRdHYkHSqp6 Jqli1CowlyHhg9eGQJdSHgz71YSsGZry2DPAavO964WbNmEquCs1QhtNq+1CbGS2MjzpZxvaEyA9U l+RuWIhDHkK0S9EYrxA9IFoeu+Spph3LYeR+FdOkS70MIdf8BT7aKP5arPF8HII7o+t/OoNh+TZ0J l/JLnm2q2VuG66jWk+CQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1lyDaQ-00AyHj-Oy; Tue, 29 Jun 2021 13:15:35 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1lyDCW-00AsxU-PO for linux-arm-kernel@lists.infradead.org; Tue, 29 Jun 2021 12:50:59 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id B3DF911B3; Tue, 29 Jun 2021 05:50:47 -0700 (PDT) Received: from e113632-lin.cambridge.arm.com (e113632-lin.cambridge.arm.com [10.1.194.46]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id B24703F718; Tue, 29 Jun 2021 05:50:46 -0700 (PDT) From: Valentin Schneider To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Marc Zyngier , Thomas Gleixner , Lorenzo Pieralisi , Vincenzo Frascino Subject: [PATCH v3 01/13] genirq: Add chip flag to denote automatic IRQ (un)masking Date: Tue, 29 Jun 2021 13:49:58 +0100 Message-Id: <20210629125010.458872-2-valentin.schneider@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210629125010.458872-1-valentin.schneider@arm.com> References: <20210629125010.458872-1-valentin.schneider@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210629_055052_986624_37F1D94C X-CRM114-Status: GOOD ( 12.06 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Some IRQ chips such as the Arm GICs automagically mask / unmask an IRQ during the handling of said IRQ. This renders further mask / unmask operations within the flow handlers redundant, which we do want to leverage as masking by itself is not cheap (Distributor access via MMIO for GICs). This is different from having a chip->irq_mask_ack() callback as this masking is: - inherent to the chip->irq_ack() and *cannot* be omitted - a *different* masking state than chip->irq_mask() (chip->irq_mask() is idempotent, chip->irq_ack() really isn't) Add a chip flag, IRQCHIP_AUTOMASKS_FLOW, to denote chips with such behaviour. Add a new IRQ data flag, IRQD_IRQ_FLOW_MASKED, to keep this flow-induced mask state separate from regular mask / unmask operations (IRQD_IRQ_MASKED). Signed-off-by: Valentin Schneider --- include/linux/irq.h | 10 ++++++++++ kernel/irq/chip.c | 5 +++++ kernel/irq/debugfs.c | 2 ++ kernel/irq/internals.h | 5 +++++ 4 files changed, 22 insertions(+) diff --git a/include/linux/irq.h b/include/linux/irq.h index 8e9a9ae471a6..ef179245a642 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -221,6 +221,8 @@ struct irq_data { * irq_chip::irq_set_affinity() when deactivated. * IRQD_IRQ_ENABLED_ON_SUSPEND - Interrupt is enabled on suspend by irq pm if * irqchip have flag IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND set. + * IRQD_IRQ_FLOW_MASKED - Interrupt is masked by ACK. Only EOI can + * clear this. */ enum { IRQD_TRIGGER_MASK = 0xf, @@ -247,6 +249,7 @@ enum { IRQD_HANDLE_ENFORCE_IRQCTX = (1 << 28), IRQD_AFFINITY_ON_ACTIVATE = (1 << 29), IRQD_IRQ_ENABLED_ON_SUSPEND = (1 << 30), + IRQD_IRQ_FLOW_MASKED = (1 << 31), }; #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors) @@ -351,6 +354,11 @@ static inline bool irqd_irq_masked(struct irq_data *d) return __irqd_to_state(d) & IRQD_IRQ_MASKED; } +static inline bool irqd_irq_flow_masked(struct irq_data *d) +{ + return __irqd_to_state(d) & IRQD_IRQ_FLOW_MASKED; +} + static inline bool irqd_irq_inprogress(struct irq_data *d) { return __irqd_to_state(d) & IRQD_IRQ_INPROGRESS; @@ -569,6 +577,7 @@ struct irq_chip { * IRQCHIP_SUPPORTS_NMI: Chip can deliver NMIs, only for root irqchips * IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND: Invokes __enable_irq()/__disable_irq() for wake irqs * in the suspend path if they are in disabled state + * IRQCHIP_AUTOMASKS_FLOW: chip->ack() masks and chip->eoi() unmasks */ enum { IRQCHIP_SET_TYPE_MASKED = (1 << 0), @@ -581,6 +590,7 @@ enum { IRQCHIP_SUPPORTS_LEVEL_MSI = (1 << 7), IRQCHIP_SUPPORTS_NMI = (1 << 8), IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND = (1 << 9), + IRQCHIP_AUTOMASKS_FLOW = (1 << 10), }; #include diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index 7f04c7d8296e..21a21baa1366 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -173,6 +173,11 @@ static void irq_state_clr_masked(struct irq_desc *desc) irqd_clear(&desc->irq_data, IRQD_IRQ_MASKED); } +static void irq_state_clr_flow_masked(struct irq_desc *desc) +{ + irqd_clear(&desc->irq_data, IRQD_IRQ_FLOW_MASKED); +} + static void irq_state_clr_started(struct irq_desc *desc) { irqd_clear(&desc->irq_data, IRQD_IRQ_STARTED); diff --git a/kernel/irq/debugfs.c b/kernel/irq/debugfs.c index e4cff358b437..3ae83622d701 100644 --- a/kernel/irq/debugfs.c +++ b/kernel/irq/debugfs.c @@ -58,6 +58,7 @@ static const struct irq_bit_descr irqchip_flags[] = { BIT_MASK_DESCR(IRQCHIP_SUPPORTS_LEVEL_MSI), BIT_MASK_DESCR(IRQCHIP_SUPPORTS_NMI), BIT_MASK_DESCR(IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND), + BIT_MASK_DESCR(IRQCHIP_AUTOMASKS_FLOW), }; static void @@ -103,6 +104,7 @@ static const struct irq_bit_descr irqdata_states[] = { BIT_MASK_DESCR(IRQD_IRQ_STARTED), BIT_MASK_DESCR(IRQD_IRQ_DISABLED), BIT_MASK_DESCR(IRQD_IRQ_MASKED), + BIT_MASK_DESCR(IRQD_IRQ_FLOW_MASKED), BIT_MASK_DESCR(IRQD_IRQ_INPROGRESS), BIT_MASK_DESCR(IRQD_PER_CPU), diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h index 54363527feea..b6c1cceddec0 100644 --- a/kernel/irq/internals.h +++ b/kernel/irq/internals.h @@ -245,6 +245,11 @@ static inline void irq_state_set_masked(struct irq_desc *desc) irqd_set(&desc->irq_data, IRQD_IRQ_MASKED); } +static inline void irq_state_set_flow_masked(struct irq_desc *desc) +{ + irqd_set(&desc->irq_data, IRQD_IRQ_FLOW_MASKED); +} + #undef __irqd_to_state static inline void __kstat_incr_irqs_this_cpu(struct irq_desc *desc) -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel