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Mon, 06 Apr 2020 04:16:27 -0700 (PDT) X-Gm-Message-State: AGi0PubXT5yX3cN15j5qkoF15WxANEPIcZ/gcBLog15Q7iQ7Vfmpd9um raIjt9mYfs5aFU+C0zPz12YC60LzbJ7U/wH8wLQ= X-Google-Smtp-Source: APiQypITnml4uw5Bo2Dl06jSoenirNs5+mpO7QBVx1fKJR101jrHWwwGnbC+r7Oa+PGUqkg9YfUDaNohTwbzcU5CTSM= X-Received: by 2002:a92:dcd1:: with SMTP id b17mr20603697ilr.80.1586171786685; Mon, 06 Apr 2020 04:16:26 -0700 (PDT) MIME-Version: 1.0 References: <20200404073047.17898-1-ardb@kernel.org> <20200406110401.GA4650@red-moon.cambridge.arm.com> In-Reply-To: <20200406110401.GA4650@red-moon.cambridge.arm.com> From: Ard Biesheuvel Date: Mon, 6 Apr 2020 13:16:15 +0200 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH] arm64: iort: take _DMA methods into account for named components To: Lorenzo Pieralisi X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200406_041628_268172_3AB516A5 X-CRM114-Status: GOOD ( 13.74 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Catalin Marinas , Will Deacon , robin.murphy@arm.com, Linux ARM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, 6 Apr 2020 at 13:04, Lorenzo Pieralisi wrote: > > On Sat, Apr 04, 2020 at 09:30:47AM +0200, Ard Biesheuvel wrote: > > Where IORT nodes for named components can describe simple DMA limits > > expressed as the number of address bits a device can driver, _DMA methods > > in AML can express more complex topologies, involving DMA translation in > > particular. > > > > Currently, we only take this _DMA method into account if it appears on a > > ACPI device node describing a PCIe root complex, but it is perfectly > > acceptable to attach them to named components as well, so let's ensure > > we take them into account in those cases too. > > ACPI spec v6.3, 6.2.4 _DMA: > > "_DMA is only defined under devices that represent buses" > Sure. But ACPI0004 module devices are also bus nodes, so that statement does not exclude named components that are defined under such a module device. > This should probably be updated and _DMA usage clarified - we can't > leave it open to interpretation. > Clarification is always better. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel