From: Lu Baolu <baolu.lu@linux.intel.com>
To: Jean-Philippe Brucker <jean-philippe@linaro.org>,
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
Cc: baolu.lu@linux.intel.com, 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()
Date: Thu, 12 Mar 2020 09:44:16 +0800 [thread overview]
Message-ID: <7019230c-3c56-e6db-6704-d73f23fa39b5@linux.intel.com> (raw)
In-Reply-To: <20200311124506.208376-9-jean-philippe@linaro.org>
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 <jean-philippe@linaro.org>
> ---
> 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()?
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;
next prev parent reply other threads:[~2020-03-12 1:44 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-11 12:44 [PATCH v2 00/11] PCI/ATS: Device-tree support and other improvements Jean-Philippe Brucker
2020-03-11 12:44 ` [PATCH v2 01/11] dt-bindings: PCI: generic: Add ats-supported property Jean-Philippe Brucker
2020-03-11 12:44 ` [PATCH v2 02/11] PCI: Add ats_supported host bridge flag Jean-Philippe Brucker
2020-03-12 21:21 ` Bjorn Helgaas
2020-03-11 12:44 ` [PATCH v2 03/11] PCI: OF: Check whether the host bridge supports ATS Jean-Philippe Brucker
2020-03-12 20:45 ` Bjorn Helgaas
2020-03-11 12:44 ` [PATCH v2 04/11] ACPI/IORT: Check ATS capability in root complex node Jean-Philippe Brucker
2020-03-12 20:58 ` Bjorn Helgaas
2020-03-11 12:45 ` [PATCH v2 05/11] PCI/ATS: Gather checks into pci_ats_supported() Jean-Philippe Brucker
2020-03-12 21:01 ` Bjorn Helgaas
2020-03-11 12:45 ` [PATCH v2 06/11] iommu/amd: Use pci_ats_supported() Jean-Philippe Brucker
2020-03-11 12:45 ` [PATCH v2 07/11] iommu/arm-smmu-v3: " Jean-Philippe Brucker
2020-03-18 21:49 ` Will Deacon
2020-03-11 12:45 ` [PATCH v2 08/11] iommu/vt-d: " Jean-Philippe Brucker
2020-03-12 1:44 ` Lu Baolu [this message]
2020-03-12 7:54 ` Jean-Philippe Brucker
2020-03-12 8:18 ` Lu Baolu
2020-03-11 12:45 ` [PATCH v2 09/11] ACPI/IORT: Drop ATS fwspec flag Jean-Philippe Brucker
2020-03-11 12:45 ` [PATCH v2 10/11] arm64: dts: fast models: Enable PCIe ATS for Base RevC FVP Jean-Philippe Brucker
2020-03-11 12:45 ` [PATCH v2 11/11] Documentation: Generalize the "pci=noats" boot parameter Jean-Philippe Brucker
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