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Date: Fri, 15 Jun 2018 00:33:12 +0000 From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com> To: Geert Uytterhoeven <geert@...ux-m68k.org> Cc: <vkoul@...nel.org>, Dan Williams <dan.j.williams@...el.com>, Magnus Damm <magnus.damm@...il.com>, Linux-Renesas <linux-renesas-soc@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Laurent Pinchart <laurent.pinchart@...asonboard.com>, Kieran Bingham <kieran@...uared.org.uk>, Geert Uytterhoeven <geert+renesas@...der.be>, <dmaengine@...r.kernel.org>, "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" <devicetree@...r.kernel.org> Subject: Re: [PATCH v2] dmaengine: rcar-dmac: don't use DMAC error interrupt Hi Geert Thank you for your feedback > > Current rcar-dmac is using DMAC error interrupt which will handle all > > channel's error. But in this design, error handling itself will be > > issue if user want to use virtualization, multi OS, etc. > > This patch removes current DMAC error interrupt handling, and handle it > > on each channel interrupt handler. > > Just wondering, what's the usage pattern where this causes a problem? > Do you plan to export part of a SYS-DMAC instance to a guest? "virtualization, multi OS" part is maybe misleading. It will be problem on non virtualization, too. > How to maintain host/guest isolation? This is another topic/issue, I think Best regards --- Kuninori Morimoto
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