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Subject: Re: [PATCH v2 0/5] PCI: dwc: improve msi handling
To:     Jisheng Zhang <Jisheng.Zhang@synaptics.com>,
        Kishon Vijay Abraham I <kishon@ti.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
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References: <20200924190421.549cb8fc@xhacker.debian>
From:   Jon Hunter <jonathanh@nvidia.com>
Message-ID: <de4d9294-4f6d-c7d1-efc7-c8ef6570bd64@nvidia.com>
Date:   Fri, 25 Sep 2020 09:53:45 +0100
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On 24/09/2020 12:05, Jisheng Zhang wrote:
> Improve the msi code:
> 1. Add proper error handling.
> 2. Move dw_pcie_msi_init() from each users to designware host to solve
> msi page leakage in resume path.

Apologies if this is slightly off topic, but I have been meaning to ask
about MSIs and PCI. On Tegra194 which uses the DWC PCI driver, whenever we
hotplug CPUs we see the following warnings ...

 [      79.068351] WARNING KERN IRQ70: set affinity failed(-22).
 [      79.068362] WARNING KERN IRQ71: set affinity failed(-22).

These interrupts are the MSIs ...

70:          0          0          0          0          0          0          0          0   PCI-MSI 134217728 Edge      PCIe PME, aerdrv
71:          0          0          0          0          0          0          0          0   PCI-MSI 134742016 Edge      ahci[0001:01:00.0]

This caused because ...

 static int dw_pci_msi_set_affinity(struct irq_data *d,
                                    const struct cpumask *mask, bool force)
 {
         return -EINVAL;
 }

Now the above is not unique to the DWC PCI host driver, it appears that
most PCIe drivers also do the same. However, I am curious if there is
any way to avoid the above warnings given that setting the affinity does
not appear to be supported in anyway AFAICT.

Cheers
Jon 

-- 
nvpublic