linux-kernel - Re: [PATCH v3 14/24] genirq/gic-v3-mbi: Remove unused wired MSI mechanics

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Date: Fri, 21 Jun 2024 16:04:28 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Marc Zyngier <maz@...nel.org>
Cc: Shivamurthy Shastri <shivamurthy.shastri@...utronix.de>,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
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Subject: Re: [PATCH v3 14/24] genirq/gic-v3-mbi: Remove unused wired MSI
 mechanics


Gentle ping!

On Mon, Jun 17 2024 at 16:15, Thomas Gleixner wrote:
> On Mon, Jun 17 2024 at 16:02, Thomas Gleixner wrote:
>> On Mon, Jun 17 2024 at 14:03, Marc Zyngier wrote:
>>> Patch 9/24 rewrites the mbigen driver. Which has nothing to do with
>>> what the gic-v3-mbi code does. They are different blocks, and the sole
>>> machine that has the mbigen IP doesn't have any gic-v3-mbi support.
>>> All they have in common are 3 random letters.
>>>
>>> What you are doing here is to kill any support for *devices* that need
>>> to signal level-triggered MSIs in that driver, and nothing to do with
>>> wire-MSI translation.
>>>
>>> So what replaces it?
>>
>> Hrm. I must have misread this mess. Let me stare some more.
>
> Ok. Found my old notes.
>
> AFAICT _all_ users of platform_device_msi_init_and_alloc_irqs():
>
>         ufs_qcom_config_esi()
>         smmu_pmu_setup_msi()
>         flexrm_mbox_probe()
>         arm_smmu_setup_msis()
>         hidma_request_msi()
>         mv_xor_v2_probe()
>
> just install their special MSI write callback. I don't see any of those
> setting up LEVEL triggered MSIs.
>
> But then I'm might be missing something. If so can you point me please
> to the usage instance which actually uses level signaled MSI?
>
> Thanks,
>
>         tglx