From: Lu Baolu <baolu.lu@linux.intel.com>
To: Jean-Philippe Brucker <jean-philippe@linaro.org>
Cc: baolu.lu@linux.intel.com, 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()
Date: Thu, 12 Mar 2020 16:18:46 +0800 [thread overview]
Message-ID: <5e508904-e432-e3b9-1fe4-0c4e11df10fc@linux.intel.com> (raw)
In-Reply-To: <20200312075436.GA568802@myrica>
On 2020/3/12 15:54, Jean-Philippe Brucker wrote:
> 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 <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()?
>
> 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.
>
Ah! Yes.
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
> Thanks,
> Jean
Best regards,
baolu
next prev parent reply other threads:[~2020-03-12 8:18 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
2020-03-12 7:54 ` Jean-Philippe Brucker
2020-03-12 8:18 ` Lu Baolu [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=5e508904-e432-e3b9-1fe4-0c4e11df10fc@linux.intel.com \
--to=baolu.lu@linux.intel.com \
--cc=amurray@thegoodpenguin.co.uk \
--cc=bhelgaas@google.com \
--cc=corbet@lwn.net \
--cc=devicetree@vger.kernel.org \
--cc=dwmw2@infradead.org \
--cc=frowand.list@gmail.com \
--cc=guohanjun@huawei.com \
--cc=iommu@lists.linux-foundation.org \
--cc=jean-philippe@linaro.org \
--cc=joro@8bytes.org \
--cc=lenb@kernel.org \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=liviu.dudau@arm.com \
--cc=lorenzo.pieralisi@arm.com \
--cc=mark.rutland@arm.com \
--cc=rjw@rjwysocki.net \
--cc=robh+dt@kernel.org \
--cc=robin.murphy@arm.com \
--cc=sudeep.holla@arm.com \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).