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Subject: Re: [PATCH 0/3] Add support to handle prefetchable memoryg
To:     Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
CC:     Thierry Reding <treding@nvidia.com>,
        Jingoo Han <jingoohan1@gmail.com>,
        "bhelgaas@google.com" <bhelgaas@google.com>,
        "gustavo.pimentel@synopsys.com" <gustavo.pimentel@synopsys.com>,
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References: <20201023195655.11242-1-vidyas@nvidia.com>
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From:   Vidya Sagar <vidyas@nvidia.com>
Message-ID: <f4d87b99-5a5b-e7de-e72a-18407a875aeb@nvidia.com>
Date:   Tue, 17 Nov 2020 23:04:57 +0530
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On 11/17/2020 5:40 PM, Lorenzo Pieralisi wrote:
> External email: Use caution opening links or attachments
>=20
>=20
> On Tue, Nov 17, 2020 at 10:08:35AM +0530, Vidya Sagar wrote:
>> Hi Lorenzo & Bjorn,
>> Sorry to bother you.
>> Could you please take a look at the patches-1 & 2 from this series?
>=20
> IIUC we should:
>=20
> (1) apply https://patchwork.kernel.org/project/linux-pci/patch/2020102618=
1652.418729-1-robh@kernel.org
> (2) apply [1,2] from this series
>=20
> For (2), are they rebased against v5.10-rc3 with (1) applied ? I need to
> check but I will probably have to use v5.10-rc3 as baseline owing to
> commit:
>=20
> 9fff3256f93d
>=20
> (1) depends on it.
>=20
> Lorenzo
My patches [1,2] from this series apply cleanly on v5.10-rc3. But with=20
(1) applied first, there is a trivial rebase required. Let me know if=20
you want me to send the trivial rebased version (of patch-2 particularly).

Thanks,
Vidya Sagar
>=20
>> Thanks,
>> Vidya Sagar
>>
>> On 11/4/2020 1:16 PM, Vidya Sagar wrote:
>>> External email: Use caution opening links or attachments
>>>
>>>
>>> Lorenzo / Bjorn,
>>> Could you please review patches-1 & 2 in this series?
>>> For the third patch, we already went with Rob's patch @
>>> http://patchwork.ozlabs.org/project/linux-pci/patch/20201026154852.2214=
83-1-robh@kernel.org/
>>>
>>>
>>> Thanks,
>>> Vidya Sagar
>>>
>>> On 10/26/2020 6:02 PM, Thierry Reding wrote:
>>>> On Sat, Oct 24, 2020 at 04:03:41AM +0000, Jingoo Han wrote:
>>>>> On 10/23/20, 3:57 PM, Vidya Sagar wrote:
>>>>>>
>>>>>> This patch series adds support for configuring the DesignWare IP's A=
TU
>>>>>> region for prefetchable memory translations.
>>>>>> It first starts by flagging a warning if the size of non-prefetchabl=
e
>>>>>> aperture goes beyond 32-bit as PCIe spec doesn't allow it.
>>>>>> And then adds required support for programming the ATU to handle hig=
her
>>>>>> (i.e. >4GB) sizes and then finally adds support for differentiating
>>>>>> between prefetchable and non-prefetchable regions and
>>>>>> configuring one of
>>>>>> the ATU regions for prefetchable memory translations purpose.
>>>>>>
>>>>>> Vidya Sagar (3):
>>>>>>     PCI: of: Warn if non-prefetchable memory aperture size is > 32-b=
it
>>>>>>     PCI: dwc: Add support to program ATU for >4GB memory aperture si=
zes
>>>>>>     PCI: dwc: Add support to handle prefetchable memory mapping
>>>>>
>>>>> For 2nd & 3rd,
>>>>> Acked-by: Jingoo <jingoohan1@gmail.com>
>>>>> But, I still want someone to ack 1st patch, not me.
>>>>>
>>>>> To Vidya,
>>>>> If possible, can you ask your coworker to give 'Tested-by'? It
>>>>> will be very helpful.
>>>>> Thank you.
>>>>
>>>> On next-20201026 (but also going back quite a while) I'm seeing this
>>>> during boot on Jetson AGX Xavier (Tegra194):
>>>>
>>>> [=C2=A0=C2=A0=C2=A0 3.493382] ahci 0001:01:00.0: version 3.0
>>>> [=C2=A0=C2=A0=C2=A0 3.493889] ahci 0001:01:00.0: SSS flag set, paralle=
l bus scan
>>>> disabled
>>>> [=C2=A0=C2=A0=C2=A0 4.497706] ahci 0001:01:00.0: controller reset fail=
ed (0xffffffff)
>>>> [=C2=A0=C2=A0=C2=A0 4.498114] ahci: probe of 0001:01:00.0 failed with =
error -5
>>>>
>>>> After applying this series, AHCI over PCI is back to normal:
>>>>
>>>> [=C2=A0=C2=A0=C2=A0 3.543230] ahci 0001:01:00.0: AHCI 0001.0000 32 slo=
ts 1 ports 6
>>>> Gbps 0x1 impl SATA mode
>>>> [=C2=A0=C2=A0=C2=A0 3.550841] ahci 0001:01:00.0: flags: 64bit ncq sntf=
 led only pmp
>>>> fbs pio slum part sxs
>>>> [=C2=A0=C2=A0=C2=A0 3.559747] scsi host0: ahci
>>>> [=C2=A0=C2=A0=C2=A0 3.561998] ata1: SATA max UDMA/133 abar m512@0x1230=
010000 port
>>>> 0x1230010100 irq 63
>>>>
>>>> So for the series:
>>>>
>>>> Tested-by: Thierry Reding <treding@nvidia.com>
>>>>