From patchwork Thu Jun 6 09:42:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Pieralisi X-Patchwork-Id: 13688204 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 A4F6C13FD84; Thu, 6 Jun 2024 09:42:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717666966; cv=none; b=YgLssORIe4fXmRW3uNJ3kOqsq2NN2qrbis4utNINpdjZhYwv/dyILIbhVXaCFn2+4oACtGNdp0DZ5uHDEQk/KZ2JpF+5zbUWI/IKb5t3z8+z+5emnK5KLy5gl6vUqiMOynBgBZSNPXBEs+LWxPs2koUUNRo1sPHGR1pFjhW5Y+s= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717666966; c=relaxed/simple; bh=hhaLQOadxU5defJpVRlf4Y1/QVE35uX/AEioCXExAuA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=CcSx0KGBbvt1nY0Tps04blPBZbM9h400wOfKmMSEF0Xf1OBI3NESZ4zvRKg7j1MqRNuelcf+N/8ydwULTtN/fbswkgPtp+quMuIlci6ezljeRN7nFxzuc4dRde+dqPrh8PTDKhnzk8Cp6DcCY10XyFIjhXa76o+qhFJzHw4L36k= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VUDzTy5W; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="VUDzTy5W" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D1B3EC4AF12; Thu, 6 Jun 2024 09:42:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1717666965; bh=hhaLQOadxU5defJpVRlf4Y1/QVE35uX/AEioCXExAuA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VUDzTy5WbhukN6ofag3xN2VXHt++vU6Hl56rU71dTE82ZDQtLJJ9ILyDfVx482NPz dSw47si84tHv5QwfT7gY8UlwRgvyO++ekoiTBovJFS6bjZCWju6HRJHkHf6LevKa0C 7EkCtLQ8BCGIhRyiBsN3nYt280V6B2B8PD4QzyOllbJm5aKmlHjqnqJJsmXJH7+hiZ Rezrr6PiNGK+GLrV61IlrOMVyfxL24nzFXGpvwMVm0nheFoUL85QWi5oI1peWdBVGc SRWVG0FSb8TKvWBJPw+cTk0xsEnaZ9/bP6NcJxElyHkqDN8Ezuk+Wkqc1HMi7l5ar/ d+qIVNditjErQ== From: Lorenzo Pieralisi To: linux-kernel@vger.kernel.org Cc: Lorenzo Pieralisi , linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org, acpica-devel@lists.linux.dev, Mark Rutland , Robin Murphy , "Rafael J. Wysocki" , Marc Zyngier , Thomas Gleixner Subject: [PATCH v6 0/1] irqchip/gic-v3: Enable non-coherent GIC designs probing Date: Thu, 6 Jun 2024 11:42:37 +0200 Message-Id: <20240606094238.757649-1-lpieralisi@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240123110332.112797-1-lpieralisi@kernel.org> References: <20240123110332.112797-1-lpieralisi@kernel.org> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This series is v6 of previous series: v5: https://lore.kernel.org/all/20240123110332.112797-1-lpieralisi@kernel.org v4: https://lore.kernel.org/all/20231227110038.55453-1-lpieralisi@kernel.org v3: https://lore.kernel.org/all/20231006125929.48591-1-lpieralisi@kernel.org v2: https://lore.kernel.org/all/20230906094139.16032-1-lpieralisi@kernel.org v1: https://lore.kernel.org/all/20230905104721.52199-1-lpieralisi@kernel.org v5 -> v6 - Rebased against v6.10-rc1 - Added Marc Zyngier's ACK v4 -> v5 - ACPICA patches merged for v6.8 - Refactored ACPI parsing code according to review - Rebased against v6.8-rc1 v3 -> v4: - Dropped patches [1-3], already merged - Added Linuxized ACPICA changes accepted upstream - Rebased against v6.7-rc3 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 (1): irqchip/gic-v3: Enable non-coherent redistributors/ITSes ACPI probing drivers/acpi/processor_core.c | 15 +++++++++++++++ drivers/irqchip/irq-gic-v3-its.c | 4 ++++ drivers/irqchip/irq-gic-v3.c | 9 +++++++++ include/linux/acpi.h | 3 +++ 4 files changed, 31 insertions(+)