linux-kernel - Re: [EXTERNAL] Re: [PATCH] arm64: defconfig: enable PCIe controller on TI platforms

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Date:   Tue, 9 May 2023 11:31:48 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     "Verma, Achal" <a-verma1@...com>, Arnd Bergmann <arnd@...db.de>,
        Vignesh Raghavendra <vigneshr@...com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Bjorn Andersson <quic_bjorande@...cinc.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>, Mark Brown <broonie@...nel.org>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Nishanth Menon <nm@...com>, Milind Parab <mparab@...ence.com>,
        Swapnil Kashinath Jakhade <sjakhade@...ence.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [EXTERNAL] Re: [PATCH] arm64: defconfig: enable PCIe controller
 on TI platforms

On 09/05/2023 11:19, Verma, Achal wrote:
> 
> Hello,
> On 5/9/2023 1:58 PM, Arnd Bergmann wrote:
>> On Tue, May 9, 2023, at 10:08, Vignesh Raghavendra wrote:
>>
>>> Also, see [0] for history. We really want these to be
>>> modules unless its necessary for bootup.
>>>
>>> You may want to revive [1] and get it to mainline
>>>
>>> [0]
>>> https://lore.kernel.org/linux-arm-kernel/CAK8P3a2VSBvOn1o+q1PYZaQ6LS9U4cz+DZGuDbisHkwNs2dAAw@mail.gmail.com/
>>> [1]
>>> https://lore.kernel.org/linux-arm-kernel/20230110153805.GA1505901@bhelgaas/
>>
>> Agreed, that seems simple enough. Ideally these should even
>> be removable modules, not just single-load but unremovable.
>>
>> Doing that may require changes to the cadence PCIe host
>> code if that does not support unloading yet (I have not
>> checked), but should not require any changes to the core
>> PCIe host code that supports loadable/removable modules.
>>
>>       Arnd
> So, my understanding is that following change is expected
> +CONFIG_PCIE_CADENCE=m
> +CONFIG_PCIE_CADENCE_HOST=m
> +CONFIG_PCIE_CADENCE_EP=m
> +CONFIG_PCI_J721E=m
> +CONFIG_PCI_J721E_HOST=m
> +CONFIG_PCI_J721E_EP=m
> +CONFIG_PCI_EPF_NTB=m
> 
> I also want to inform that pci_j721e.c is a single file with both host 
> and EP functionality, last attempt to build it as modules depending on 
> host or EP selected failed because of symbols dependency.
> Refactoring of pci_j721e.c into common, host and EP specific files could 
> work similar to the Cadence driver, So I will follow this way and push 
> the changes.
> 
> Please let me know if there are concerns.

Aren't HOST and EP just customizing main module?

Best regards,
Krzysztof