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 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 905B7C282DE for ; Fri, 7 Mar 2025 13:03:18 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 050F110E994; Fri, 7 Mar 2025 13:03:18 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="tkhI010w"; dkim-atps=neutral Received: from nyc.source.kernel.org (nyc.source.kernel.org [147.75.193.91]) by gabe.freedesktop.org (Postfix) with ESMTPS id B797310E994 for ; Fri, 7 Mar 2025 13:03:08 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 3FBDDA45771; Fri, 7 Mar 2025 12:57:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1BBBFC4CED1; Fri, 7 Mar 2025 13:03:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741352587; bh=YSC4zTaduDcQ0pfmQdR1zUB7q5EQNvRgQo9Tv2ARz2I=; h=Date:From:To:Subject:In-Reply-To:References:Cc:From; b=tkhI010wfshTuPhNuEdSyReoQ9bVkHjkYaaBVYtr8nW0YanG5V4wAL8WSZr77SEmg DDgdXYgIf/JXXWYaQC6BpnQSSJKC8C4Ze+09YfJAKPgavr2J4bO1mMRVGcCBYzc3pX uua6HUnkdSK5/CqCrlAUfZqCVoRkFYnJg4UhS7g3k+m9oJhtw1YaVwNB0xxkMWeBts QHlvRChw04m5eykI779u4i7DfDwrgRjnrU1GyHHrWBdW4dOHuURf5H0GfWmLsd5Hc1 SC4cW5YUxZRmuk07DpYonvL87yIYsk9yqJUEjmY3Ed5NX9r7sp6o90QI83z48iLxtf eyyMg77FopS6w== Message-ID: <27c8aaa39d53c4af0328442662f966be@kernel.org> Date: Fri, 07 Mar 2025 13:03:04 +0000 From: "Maxime Ripard" To: "Thomas Zimmermann" Subject: Re: [PATCH v2 1/5] drm/prime: Support dedicated DMA device for dma-buf imports In-Reply-To: <20250307080836.42848-2-tzimmermann@suse.de> References: <20250307080836.42848-2-tzimmermann@suse.de> Cc: admin@kodeit.net, airlied@gmail.com, airlied@redhat.com, christian.koenig@amd.com, dri-devel@lists.freedesktop.org, gargaditya08@live.com, hdegoede@redhat.com, jani.nikula@intel.com, javierm@redhat.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, sean@poorly.run, simona@ffwll.ch, sumit.semwal@linaro.org, "Maxime Ripard" Content-Transfer-Encoding: 7bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Fri, 7 Mar 2025 09:03:59 +0100, Thomas Zimmermann wrote: > Importing dma-bufs via PRIME requires a DMA-capable device. Devices on > peripheral busses, such as USB, often cannot perform DMA by themselves. > Without DMA-capable device PRIME import fails. DRM drivers for USB > devices already use a separate DMA device for dma-buf imports. Make the > mechanism generally available. > > [ ... ] Reviewed-by: Maxime Ripard Thanks! Maxime