From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joerg Roedel Subject: Re: iommu/amd: lock splitting & GFP_KERNEL allocation Date: Thu, 15 Mar 2018 14:01:45 +0100 Message-ID: <20180315130144.v25fugc2kfglptby@8bytes.org> References: <20180223222736.18542-1-bigeasy@linutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <20180223222736.18542-1-bigeasy-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Sebastian Andrzej Siewior Cc: iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: iommu@lists.linux-foundation.org Hi Sebastian, On Fri, Feb 23, 2018 at 11:27:26PM +0100, Sebastian Andrzej Siewior wrote: > I have no idea why but suddenly my A10 box complained loudly about > locking and memory allocations within the iommu code under RT. Looking > at the code it has been like this for a longer time so the iommu must > have appeared recently (well there was a bios upgrade due to other > issues so it might have enabled it). > > The goal here is to make the memory allocation in get_irq_table() not > with disabled interrupts and having as little raw_spin_lock as possible > while having them if the caller is also holding one (like desc->lock > during IRQ-affinity changes). > > The patches were boot tested on an AMD EPYC 7601. Thanks for these patches, I really like the cleanups and the improved locking. Please rebase against x86/amd in the iommu branch and address the other comment I have, then I put them into my tree. Thanks, Joerg