From mboxrd@z Thu Jan 1 00:00:00 1970 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 23FF1218AC4; Thu, 26 Feb 2026 10:46:24 +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=1772102785; cv=none; b=UxtLZj2zKb7y9S27pLlpHMFajQ6OEzSbXWhNV9WPoGVtI/5XY3KRx3xyax5OOVGH/0pbT1b2oLCViS3rBeayz/aVqbgN3ToxTdn4gUIwJ8GnN2XyYTkfKPvKqqaa5k6QIgvI3y5kEmYnS+tJbmVfKuMSetcv6OiSONbMzFdMUIM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772102785; c=relaxed/simple; bh=RvgwqJ5lHgVsbH3VM1TF53+jbTgfmgEMcEMpt6E6IKc=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=V8jjsDnyDElDbKWc5ui0EWHz3Yc1guGfAHciCtofj6moufK2PGOOV1ISuvuuMi6XvDPQhrc8EAHXzTUdRTyBcOkQT7KHzC7HvJSJW5uiiyd2XiSueyKHUTafg1nfoDGCmz+Q/DkKJlB0jEpnDO9TNljkBKls04sO7YHETrqimIM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Z9W416l3; 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="Z9W416l3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A95DBC116C6; Thu, 26 Feb 2026 10:46:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772102784; bh=RvgwqJ5lHgVsbH3VM1TF53+jbTgfmgEMcEMpt6E6IKc=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=Z9W416l3lvUFB5co/SPsHLWdDZJQ+8I5Yidnhl0eXEvnsYvwK9UAYEMLjW7QOisbO gLImo1eBRutyFpsEyl1JdxpLbvVfabIctJH1uDQAKVP2K8/6EjSYMVOP+VXZP9v8eR WCMwZGyx8JnGMMoqYZuKm24QXLxvTwzx8M8zcu774hCEEAVZc1yspD9TUy1brTj1mW lFe1rjNM74gCva35CPBQhmZ8duAHerJjd4adAxr5MlxpvGd7wutmoZLrYx+1XpunjN 4LLN36el7W/yNaQ15UCG3A0DospBmY+sS26ClVvlt2GSHbRQP4waY5dAtMnoIPWBNk XwSBJF/hcMmWA== Message-ID: Date: Thu, 26 Feb 2026 11:46:17 +0100 Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC 04/18] accel/qda: Add built-in compute CB bus for QDA and integrate with IOMMU To: Ekansh Gupta , Oded Gabbay , Jonathan Corbet , Shuah Khan , Joerg Roedel , Will Deacon , Robin Murphy , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Sumit Semwal , =?UTF-8?Q?Christian_K=C3=B6nig?= Cc: dri-devel@lists.freedesktop.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, iommu@lists.linux.dev, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, Srinivas Kandagatla , Dmitry Baryshkov , Bharath Kumar , Chenna Kesava Raju References: <20260224-qda-firstpost-v1-0-fe46a9c1a046@oss.qualcomm.com> <20260224-qda-firstpost-v1-4-fe46a9c1a046@oss.qualcomm.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 23/02/2026 20:08, Ekansh Gupta wrote: > Introduce a built-in compute context-bank (CB) bus used by the Qualcomm > DSP accelerator (QDA) driver to represent DSP CB devices that require > IOMMU configuration. This separates the CB bus from the QDA driver and > allows QDA to remain a loadable module while the bus is always built-in. > > A new bool Kconfig symbol DRM_ACCEL_QDA_COMPUTE_BUS is added and is > selected by the main DRM_ACCEL_QDA driver. The parent accel Makefile is > updated to descend into the QDA directory for both built-in and module > builds so that the CB bus is compiled into vmlinux while the driver > remains modular. > > The CB bus is registered at postcore_initcall() time and is exposed to > the IOMMU core through iommu_buses[] in the same way as the Tegra > host1x context-bus. This enables later patches to create CB devices on > this bus and obtain IOMMU domains for them. > > Signed-off-by: Ekansh Gupta > --- > drivers/accel/Makefile | 1 + > drivers/accel/qda/Kconfig | 5 +++++ > drivers/accel/qda/Makefile | 2 ++ > drivers/accel/qda/qda_compute_bus.c | 23 +++++++++++++++++++++++ > drivers/iommu/iommu.c | 4 ++++ > include/linux/qda_compute_bus.h | 22 ++++++++++++++++++++++ Do not combine independent work into one patch. Also, your patch has clear patch warnings, so please review it BEFORE you send. Best regards, Krzysztof