linux-kernel - Re: [PATCH 0/2] PCI: dwc: Add support to handle prefetchable memory separately

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Date:   Mon, 5 Oct 2020 17:49:27 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:     Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>,
        "jingoohan1@...il.com" <jingoohan1@...il.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "amurray@...goodpenguin.co.uk" <amurray@...goodpenguin.co.uk>,
        "robh@...nel.org" <robh@...nel.org>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        "jonathanh@...dia.com" <jonathanh@...dia.com>,
        <alan.mikhak@...ive.com>, <kishon@...com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kthota@...dia.com" <kthota@...dia.com>,
        "mmaddireddy@...dia.com" <mmaddireddy@...dia.com>,
        "sagar.tv@...il.com" <sagar.tv@...il.com>
Subject: Re: [PATCH 0/2] PCI: dwc: Add support to handle prefetchable memory
 separately



On 9/7/2020 10:40 PM, Lorenzo Pieralisi wrote:
> External email: Use caution opening links or attachments
> 
> 
> On Mon, Jul 06, 2020 at 10:05:06AM +0530, Vidya Sagar wrote:
>>
>>
>> On 18-Jun-20 12:26 AM, Vidya Sagar wrote:
>>>
>>>
>>> On 02-Jun-20 10:37 PM, Gustavo Pimentel wrote:
>>>> External email: Use caution opening links or attachments
>>>>
>>>>
>>>> On Tue, Jun 2, 2020 at 11:9:38, Vidya Sagar <vidyas@...dia.com> wrote:
>>>>
>>>>> In this patch series,
>>>>> Patch-1
>>>>> adds required infrastructure to deal with prefetchable memory region
>>>>> information coming from 'ranges' property of the respective
>>>>> device-tree node
>>>>> separately from non-prefetchable memory region information.
>>>>> Patch-2
>>>>> Adds support to use ATU region-3 for establishing the mapping
>>>>> between CPU
>>>>> addresses and PCIe bus addresses.
>>>>> It also changes the logic to determine whether mapping is
>>>>> required or not by
>>>>> checking both CPU address and PCIe bus address for both prefetchable and
>>>>> non-prefetchable regions. If the addresses are same, then, it is
>>>>> understood
>>>>> that 1:1 mapping is in place and there is no need to setup ATU mapping
>>>>> whereas if the addresses are not the same, then, there is a need
>>>>> to setup ATU
>>>>> mapping. This is certainly true for Tegra194 and what I heard
>>>>> from our HW
>>>>> engineers is that it should generally be true for any DWC based
>>>>> implementation
>>>>> also.
>>>>> Hence, I request Synopsys folks (Jingoo Han & Gustavo Pimentel
>>>>> ??) to confirm
>>>>> the same so that this particular patch won't cause any
>>>>> regressions for other
>>>>> DWC based platforms.
>>>>
>>>> Hi Vidya,
>>>>
>>>> Unfortunately due to the COVID-19 lockdown, I can't access my development
>>>> prototype setup to test your patch.
>>>> It might take some while until I get the possibility to get access to it
>>>> again.
>>> Hi Gustavo,
>>> Did you find time to check this?
>>> Adding Kishon and Alan as well to take a look at this and verify on
>>> their platforms if possible.
>> Hi Kishon and Alan, did you find time to verify this on your respective
>> platforms?
> 
> Yes please. I would like to merge this code, in preparation for that
> to happen mind rebasing the series against my pci/dwc branch with
> Rob's suggested changes implemented ?
Hi,
Apologies for the delay in reply. I was on leave and couldn't really 
look into it.
I pushed a new patch on top of your pci/dwc branch at 
http://patchwork.ozlabs.org/project/linux-pci/patch/20201005121351.32516-1-vidyas@nvidia.com/

@Rob and @Lorenzo, please review it.
Since I changed the subject, I pushed it as a new patch and not as V2 of 
the previous patch set. I hope this is fine.

Thanks,
Vidya Sagar

> 
> Thanks a lot,
> Lorenzo
>