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[23.128.96.18]) by mx.google.com with ESMTP id c18si17325811edw.232.2021.08.09.05.54.04; Mon, 09 Aug 2021 05:54:27 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=itunlC02; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233310AbhHIMxE (ORCPT + 99 others); Mon, 9 Aug 2021 08:53:04 -0400 Received: from mail.kernel.org ([198.145.29.99]:36818 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233093AbhHIMxE (ORCPT ); Mon, 9 Aug 2021 08:53:04 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D482360E78; Mon, 9 Aug 2021 12:52:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1628513564; bh=2GdN8DXcLKY6quaCw1rtuvP0Kw0zfqRfIg+LPre32c4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=itunlC02CLGsvDphIlDR/5dpsZL296ArW0IxZolvss0dFEd7dhOrjDGQ5oL8kUi+8 ZSLKB6GrOeIEQnEL0YG+kij+D39yylkWqWcsQYmN31c5XX9gOpac6sJ5nQ2WJ9JndP m7fh+4pnBwzVj+Lh/HWS0Tbf65NwwGNYY89zjNmxi/g37dk646P9n/qDMST1+ZkGnp lwFctwo1zC2t8zfLRGCtw+1JqnX68dcCjppXGZt5+LvBO6y5oYoZGkCxMYch3B6Vo4 JngGmJo9wH8dZ+UsstcyL2rGsf8wL2qCBNJbZRPT1wjrdOm2T0Yia767C61TT3mFlv 5ubgaHRseS4Kw== Date: Mon, 9 Aug 2021 13:52:39 +0100 From: Will Deacon To: Robin Murphy Cc: joro@8bytes.org, linux-kernel@vger.kernel.org, dianders@chromium.org, iommu@lists.linux-foundation.org, rajatja@google.com, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v3 24/25] iommu/dma: Factor out flush queue init Message-ID: <20210809125238.GB1097@willie-the-truck> References: <3b5284ee394f267ba966839173f874fc9a996bb2.1628094601.git.robin.murphy@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3b5284ee394f267ba966839173f874fc9a996bb2.1628094601.git.robin.murphy@arm.com> User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Aug 04, 2021 at 06:15:52PM +0100, Robin Murphy wrote: > Factor out flush queue setup from the initial domain init so that we > can potentially trigger it from sysfs later on in a domain's lifetime. > > Reviewed-by: Lu Baolu > Reviewed-by: John Garry > Signed-off-by: Robin Murphy > --- > drivers/iommu/dma-iommu.c | 30 ++++++++++++++++++++---------- > include/linux/dma-iommu.h | 9 ++++++--- > 2 files changed, 26 insertions(+), 13 deletions(-) > > diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c > index 2e19505dddf9..f51b8dc99ac6 100644 > --- a/drivers/iommu/dma-iommu.c > +++ b/drivers/iommu/dma-iommu.c > @@ -310,6 +310,25 @@ static bool dev_is_untrusted(struct device *dev) > return dev_is_pci(dev) && to_pci_dev(dev)->untrusted; > } > > +int iommu_dma_init_fq(struct iommu_domain *domain) > +{ > + struct iommu_dma_cookie *cookie = domain->iova_cookie; > + > + if (domain->type != IOMMU_DOMAIN_DMA_FQ) > + return -EINVAL; > + if (cookie->fq_domain) > + return 0; > + > + if (init_iova_flush_queue(&cookie->iovad, iommu_dma_flush_iotlb_all, > + iommu_dma_entry_dtor)) { > + pr_warn("iova flush queue initialization failed\n"); > + domain->type = IOMMU_DOMAIN_DMA; > + return -ENODEV; I do find this a bit odd: we assert that the caller has set domain->type to IOMMU_DOMAIN_DMA_FQ but then on failure we reset it to IOMMU_DOMAIN_DMA here. I think it would be less error-prone if the setting of domain->type was handled in the same function. Will