From patchwork Fri Oct 6 12:59:24 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Pieralisi X-Patchwork-Id: 730073 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 BA39C1F604; Fri, 6 Oct 2023 12:59:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="bETbu+rA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6F24AC433C8; Fri, 6 Oct 2023 12:59:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1696597177; bh=4MA/LskURMEJ12KVbP+fP6rhRzcvwd/Y3VAARsbtgKE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bETbu+rA1puRoxryATnjVCGhe6ye4E0ESqOWM6iYAC/DHD1zut2RX78JHqc+hYyGD 7z2fo359Izt9OJ6Hs+5nywrwiZ9aa/o4oMbrsFy1GIHGEfRk/LmdxFIrsJsU1uIArh rDdSMpM6jmotdHt3qsJXrcIYljGLxAUhLLvdrELcASS5Cs3JVXdvbXUbpats7CgkEC dvbaWN4pbyoqOkvFo7ZHQgSMDQv2qyVORbjMuqEA5VGAI8Bg80N522iXxKGc1Ll9c7 obD9dwFN/dGaGqIOarT0IeFfTcKpMdf9iRq05P2TmVklXSHoZobiMFEGOZa/vvrc9c uekebDszGTMxQ== From: Lorenzo Pieralisi To: linux-kernel@vger.kernel.org Cc: Lorenzo Pieralisi , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-acpi@vger.kernel.org, Mark Rutland , Robin Murphy , "Rafael J. Wysocki" , Rob Herring , Fang Xiang , Marc Zyngier Subject: [PATCH v3 0/5] irqchip/gic-v3: Enable non-coherent GIC designs probing Date: Fri, 6 Oct 2023 14:59:24 +0200 Message-Id: <20231006125929.48591-1-lpieralisi@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230905104721.52199-1-lpieralisi@kernel.org> References: <20230905104721.52199-1-lpieralisi@kernel.org> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This series is v3 of previous series: v2: https://lore.kernel.org/all/20230906094139.16032-1-lpieralisi@kernel.org v1: https://lore.kernel.org/all/20230905104721.52199-1-lpieralisi@kernel.org v2 -> v3: - Added ACPICA temporary changes and ACPI changes to implement ECR https://bugzilla.tianocore.org/show_bug.cgi?id=4557 - ACPI changes are for testing purposes - subject to ECR code first approval v1 -> v2: - Updated DT bindings as per feedback - Updated patch[2] to use GIC quirks infrastructure Original cover letter --- The GICv3 architecture specifications provide a means for the system programmer to set the shareability and cacheability attributes the GIC components (redistributors and ITSes) use to drive memory transactions. Albeit the architecture give control over shareability/cacheability memory transactions attributes (and barriers), it is allowed to connect the GIC interconnect ports to non-coherent memory ports on the interconnect, basically tying off shareability/cacheability "wires" and de-facto making the redistributors and ITSes non-coherent memory observers. This series aims at starting a discussion over a possible solution to this problem, by adding to the GIC device tree bindings the standard dma-noncoherent property. The GIC driver uses the property to force the redistributors and ITSes shareability attributes to non-shareable, which consequently forces the driver to use CMOs on GIC memory tables. On ARM DT DMA is default non-coherent, so the GIC driver can't rely on the generic DT dma-coherent/non-coherent property management layer (of_dma_is_coherent()) which would default all GIC designs in the field as non-coherent; it has to rely on ad-hoc dma-noncoherent property handling. When a consistent approach is agreed upon for DT an equivalent binding will be put forward for ACPI based systems. Lorenzo Pieralisi (4): dt-bindings: interrupt-controller: arm,gic-v3: Add dma-noncoherent property irqchip/gic-v3: Enable non-coherent redistributors/ITSes DT probing ACPICA: Add new MADT GICC/GICR/ITS flags handling [code first] irqchip/gic-v3: Enable non-coherent redistributors/ITSes ACPI probing Marc Zyngier (1): irqchip/gic-v3-its: Split allocation from initialisation of its_node .../interrupt-controller/arm,gic-v3.yaml | 12 ++ drivers/acpi/processor_core.c | 21 +++ drivers/irqchip/irq-gic-common.h | 12 ++ drivers/irqchip/irq-gic-v3-its.c | 174 +++++++++++------- drivers/irqchip/irq-gic-v3.c | 22 +++ include/acpi/actbl2.h | 11 +- include/linux/acpi.h | 3 + 7 files changed, 189 insertions(+), 66 deletions(-)