Messages in this thread | | | Subject | Re: [PATCH v2 0/5] PCI: dwc: improve msi handling | From | Jon Hunter <> | 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
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