From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joerg Roedel Subject: Re: [PATCH 6/6] iommu/arm-smmu: Make use of phandle iterators in device-tree parsing Date: Wed, 23 Mar 2016 12:51:28 +0100 Message-ID: <20160323115128.GB17838@8bytes.org> References: <1458669509-7178-1-git-send-email-joro@8bytes.org> <1458669509-7178-7-git-send-email-joro@8bytes.org> <56F194BC.3020709@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <56F194BC.3020709-5wv7dgnIgG8@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Robin Murphy Cc: Rob Herring , grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, jroedel-l3A5Bk7waGM@public.gmane.org, Will Deacon , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org List-Id: devicetree@vger.kernel.org Hi Robin, On Tue, Mar 22, 2016 at 06:53:48PM +0000, Robin Murphy wrote: > In a stream-matching implementation, a device may quite legitimately > own anything up to _all_ of the stream IDs (32768, or 65536 if we > ever implement support for the SMMUv2 EXID extension), so this is > only a genuine limit for stream indexing (and if anyone ever > actually made one of those, I don't think they're running mainline > on it). Do you mean we might see a lot more than the currently 128 supported stream-ids for an smmu? > Alternatively, how straightforward is it to change the DT on your > machine? I'll be getting a v2 of [1] out in a couple of weeks (after > imminent holidays), which already gets rid of MAX_MASTER_STREAMIDS > altogether, and might also have grown proper SMR support by then. Hmm, I don't know how to change the DT of this Seattle machine. I think it is provided by the ACPI BIOS. At least it boots with grub2 and not u-boot and there is no DT in /boot. Joerg -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html