linux-kernel - Re: [PATCH v4 0/3] PCI: Add a quirk to enable SVA for HiSilicon chip

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Date:   Mon, 28 Jun 2021 09:52:25 +0800
From:   Zhou Wang <wangzhou1@...ilicon.com>
To:     Zhangfei Gao <zhangfei.gao@...aro.org>,
        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>
CC:     <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 0/3] PCI: Add a quirk to enable SVA for HiSilicon chip

On 2021/6/9 11:36, 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.
> 
> Jean's dma-can-stall patchset has been accepted
> https://lore.kernel.org/linux-iommu/162314710744.3707892.6632600736379822229.b4-ty@kernel.org/
> 
> 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(-)
>

Hi Bjorn,

Could you take this series for coming v5.14-rc1? With this series, HiSilicon accelerators(ZIP/SEC/HPRE)
will work in mainline, as the related SMMU series had been accepted.

Best,
Zhou