linux-kernel - Re: [PATCH v5 0/3] PCI: Add a quirk to enable SVA for HiSilicon chip

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Date:   Fri, 27 Aug 2021 09:02:41 +0800
From:   Zhangfei Gao <zhangfei.gao@...aro.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        jean-philippe <jean-philippe@...aro.org>,
        kenneth-lee-2012@...mail.com, Wangzhou <wangzhou1@...ilicon.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 0/3] PCI: Add a quirk to enable SVA for HiSilicon chip



On 2021/8/27 上午3:30, Bjorn Helgaas wrote:
> On Tue, Jul 13, 2021 at 10:54:33AM +0800, Zhangfei Gao wrote:
>> HiSilicon KunPeng920 and KunPeng930 have devices appear as PCI but are
>> actually on the AMBA bus. These fake PCI devices have PASID capability
>> though not supporting TLP.
>>
>> Add a quirk to set pasid_no_tlp and dma-can-stall for these devices.
>>
>> v5:
>> no change, base on 5.14-rc1
>>
>> v4:
>> Applied to Linux 5.13-rc2, and build successfully with only these three patches.
>>
>> v3:
>> https://lore.kernel.org/linux-pci/1615258837-12189-1-git-send-email-zhangfei.gao@linaro.org/
>> Rebase to Linux 5.12-rc1
>> Change commit msg adding:
>> Property dma-can-stall depends on patchset
>> https://lore.kernel.org/linux-iommu/20210302092644.2553014-1-jean-philippe@linaro.org/
>>
>> By the way the patchset can directly applied on 5.12-rc1 and build successfully though
>> without the dependent patchset.
>>
>> v2:
>> Add a new pci_dev bit: pasid_no_tlp, suggested by Bjorn
>> "Apparently these devices have a PASID capability.  I think you should
>> add a new pci_dev bit that is specific to this idea of "PASID works
>> without TLP prefixes" and then change pci_enable_pasid() to look at
>> that bit as well as eetlp_prefix_path."
>> https://lore.kernel.org/linux-pci/20210112170230.GA1838341@bjorn-Precision-5520/
>>
>> Zhangfei Gao (3):
>>    PCI: PASID can be enabled without TLP prefix
>>    PCI: Add a quirk to set pasid_no_tlp for HiSilicon chips
>>    PCI: Set dma-can-stall for HiSilicon chips
>>
>>   drivers/pci/ats.c    |  2 +-
>>   drivers/pci/quirks.c | 27 +++++++++++++++++++++++++++
>>   include/linux/pci.h  |  1 +
>>   3 files changed, 29 insertions(+), 1 deletion(-)
> Applied with Robin's ack to pci/iommu for v5.15, thanks!
Great, thanks  Bjorn and Robin.