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Thu, 12 Mar 2020 00:54:44 -0700 (PDT) Received: from myrica ([2001:171b:c9a8:fbc0:116c:c27a:3e7f:5eaf]) by smtp.gmail.com with ESMTPSA id f207sm12446498wme.9.2020.03.12.00.54.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Mar 2020 00:54:43 -0700 (PDT) Date: Thu, 12 Mar 2020 08:54:36 +0100 From: Jean-Philippe Brucker To: Lu Baolu Cc: bhelgaas@google.com, will@kernel.org, robh+dt@kernel.org, joro@8bytes.org, sudeep.holla@arm.com, linux-doc@vger.kernel.org, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-acpi@vger.kernel.org, iommu@lists.linux-foundation.org, lorenzo.pieralisi@arm.com, corbet@lwn.net, mark.rutland@arm.com, liviu.dudau@arm.com, guohanjun@huawei.com, rjw@rjwysocki.net, lenb@kernel.org, robin.murphy@arm.com, dwmw2@infradead.org, amurray@thegoodpenguin.co.uk, frowand.list@gmail.com Subject: Re: [PATCH v2 08/11] iommu/vt-d: Use pci_ats_supported() Message-ID: <20200312075436.GA568802@myrica> References: <20200311124506.208376-1-jean-philippe@linaro.org> <20200311124506.208376-9-jean-philippe@linaro.org> <7019230c-3c56-e6db-6704-d73f23fa39b5@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <7019230c-3c56-e6db-6704-d73f23fa39b5@linux.intel.com> Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org Hi Baolu, On Thu, Mar 12, 2020 at 09:44:16AM +0800, Lu Baolu wrote: > Hi Jean, > > On 2020/3/11 20:45, Jean-Philippe Brucker wrote: > > The pci_ats_supported() function checks if a device supports ATS and is > > allowed to use it. > > > > Signed-off-by: Jean-Philippe Brucker > > --- > > drivers/iommu/intel-iommu.c | 9 +++------ > > 1 file changed, 3 insertions(+), 6 deletions(-) > > > > diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c > > index 6fa6de2b6ad5..17208280ef5c 100644 > > --- a/drivers/iommu/intel-iommu.c > > +++ b/drivers/iommu/intel-iommu.c > > @@ -1454,8 +1454,7 @@ static void iommu_enable_dev_iotlb(struct device_domain_info *info) > > !pci_reset_pri(pdev) && !pci_enable_pri(pdev, 32)) > > info->pri_enabled = 1; > > #endif > > - if (!pdev->untrusted && info->ats_supported && > > - pci_ats_page_aligned(pdev) && > > + if (info->ats_supported && pci_ats_page_aligned(pdev) && > > !pci_enable_ats(pdev, VTD_PAGE_SHIFT)) { > > info->ats_enabled = 1; > > domain_update_iotlb(info->domain); > > @@ -2611,10 +2610,8 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu, > > if (dev && dev_is_pci(dev)) { > > struct pci_dev *pdev = to_pci_dev(info->dev); > > - if (!pdev->untrusted && > > - !pci_ats_disabled() && > > The pci_ats_disabled() couldn't be replaced by pci_ats_supported(). Even > pci_ats_supported() returns true, user still can disable it. Or move > ats_disabled into pci_ats_supported()? It is already there, but hidden behind the "if (!dev->ats_cap)": pci_ats_init() only sets dev->ats_cap after checking that pci_ats_disabled() returns false. Thanks, Jean > > Best regards, > baolu > > > - ecap_dev_iotlb_support(iommu->ecap) && > > - pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ATS) && > > + if (ecap_dev_iotlb_support(iommu->ecap) && > > + pci_ats_supported(pdev) && > > dmar_find_matched_atsr_unit(pdev)) > > info->ats_supported = 1;