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Wed, 18 Dec 2019 12:00:18 -0500 X-MC-Unique: 9UUkOd8SOmCuHuHDl5aHpg-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 797B119586C8; Wed, 18 Dec 2019 17:00:14 +0000 (UTC) Received: from [10.36.116.117] (ovpn-116-117.ams2.redhat.com [10.36.116.117]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 1A81460C18; Wed, 18 Dec 2019 17:00:09 +0000 (UTC) Subject: Re: [PATCH v3 08/13] iommu/arm-smmu-v3: Propate ssid_bits To: Jean-Philippe Brucker References: <20191209180514.272727-1-jean-philippe@linaro.org> <20191209180514.272727-9-jean-philippe@linaro.org> <466bbc57-79d4-274c-67bc-4ed591da9968@redhat.com> <20191218160834.GG2371701@myrica> From: Auger Eric Message-ID: Date: Wed, 18 Dec 2019 18:00:08 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <20191218160834.GG2371701@myrica> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191218_090038_210350_6950F9E9 X-CRM114-Status: GOOD ( 15.02 ) 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: mark.rutland@arm.com, devicetree@vger.kernel.org, lorenzo.pieralisi@arm.com, linux-pci@vger.kernel.org, joro@8bytes.org, sudeep.holla@arm.com, rjw@rjwysocki.net, robin.murphy@arm.com, linux-acpi@vger.kernel.org, iommu@lists.linux-foundation.org, robh+dt@kernel.org, jonathan.cameron@huawei.com, guohanjun@huawei.com, bhelgaas@google.com, zhangfei.gao@linaro.org, will@kernel.org, linux-arm-kernel@lists.infradead.org, lenb@kernel.org 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 Hi Jean, On 12/18/19 5:08 PM, Jean-Philippe Brucker wrote: > On Tue, Dec 17, 2019 at 06:07:26PM +0100, Auger Eric wrote: >> Hi Jean, >> >> On 12/9/19 7:05 PM, Jean-Philippe Brucker wrote: >> >> s/Propate/Propagate in the commit title. >>> Now that we support substream IDs, initialize s1cdmax with the number of >>> SSID bits supported by a master and the SMMU. >>> >>> Context descriptor tables are allocated once for the first master >>> attached to a domain. Therefore attaching multiple devices with >>> different SSID sizes is tricky, and we currently don't support it. >>> >>> As a future improvement it would be nice to at least support attaching a >>> SSID-capable device to a domain that isn't using SSID, by reallocating >>> the SSID table. >> Isn't that use case relevant (I mean using both devices in a non SSID >> use case). For platform devices you can work this around with FW but for >> PCI devices? > > Normally each device gets its own domain. Especially since PASID is a PCI > Express capability, I expect them to be properly isolated with ACS, each > with its own IOMMU group. So I don't think this is too relevant for the > moment, it would be a quirk for a broken system. OK Eric > > Thanks, > Jean > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel