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[216.228.112.22]) by smtp.gmail.com with ESMTPSA id a2sm2583492pfk.201.2020.09.28.15.36.33 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Mon, 28 Sep 2020 15:36:33 -0700 (PDT) Date: Mon, 28 Sep 2020 15:31:15 -0700 From: Nicolin Chen To: Dmitry Osipenko Cc: thierry.reding@gmail.com, joro@8bytes.org, krzk@kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, jonathanh@nvidia.com Subject: Re: [PATCH 4/5] iommu/tegra-smmu: Add PCI support Message-ID: <20200928223114.GA4816@Asurada-Nvidia> References: <20200926080719.6822-1-nicoleotsuka@gmail.com> <20200926080719.6822-5-nicoleotsuka@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Sep 27, 2020 at 01:18:15AM +0300, Dmitry Osipenko wrote: > 26.09.2020 11:07, Nicolin Chen пишет: > ... > > +#ifdef CONFIG_PCI > > + if (!iommu_present(&pci_bus_type)) { > > Is this iommu_present() check really needed? > > > + pci_request_acs(); > > Shouldn't pci_request_acs() be invoked *after* bus_set_iommu() succeeds? Will move it after that. Thanks!