On Wed, Sep 14, 2016 at 04:18:49PM +0200, Christoph Hellwig wrote:
> static int msix_setup_entries(struct pci_dev *dev, void __iomem *base,
> - struct msix_entry *entries, int nvec)
> + struct msix_entry *entries, int nvec,
> + bool affinity)
> {
> - const struct cpumask *mask = NULL;
> + struct cpumask *curmsk, *masks = NULL;
> struct msi_desc *entry;
> - int cpu = -1, i;
> -
> - for (i = 0; i < nvec; i++) {
> - if (dev->irq_affinity) {
> - cpu = cpumask_next(cpu, dev->irq_affinity);
> - if (cpu >= nr_cpu_ids)
> - cpu = cpumask_first(dev->irq_affinity);
> - mask = cpumask_of(cpu);
> - }
> + int ret, i;
>
> - entry = alloc_msi_entry(&dev->dev, 1, NULL);
> + if (affinity) {
> + masks = irq_create_affinity_masks(dev->irq_affinity, nvec);
> + if (!masks)
> + pr_err("Unable to allocate affinity masks, ignoring\n");
Okay, so if we can tolerate affinity mask failure here, then we should be
able to tolerate it everywhere. Therefore, this piece of code (I pointed
in my other mail) in __pci_enable_msi_range() should not bail out:
if (affinity) {
nvec = irq_calc_affinity_vectors(dev->irq_affinity,
nvec);
if (nvec < minvec)
return -ENOSPC;
}
> + }
> +
> + for (i = 0, curmsk = masks; i < nvec; i++) {
> + entry = alloc_msi_entry(&dev->dev, 1, curmsk);
> if (!entry) {
> if (!i)
> iounmap(base);
> else
> free_msi_irqs(dev);
> /* No enough memory. Don't try again */
> - return -ENOMEM;
> + ret = -ENOMEM;
> + goto out;
> }
>
> entry->msi_attrib.is_msix = 1;
> @@ -710,11 +720,14 @@ static int msix_setup_entries(struct pci_dev *dev, void __iomem *base,
> entry->msi_attrib.entry_nr = i;
> entry->msi_attrib.default_irq = dev->irq;
> entry->mask_base = base;
> - entry->affinity = mask;
>
> list_add_tail(&entry->list, dev_to_msi_list(&dev->dev));
> + if (masks)
> + curmsk++;
> }
> -
> + ret = 0;
> +out:
> + kfree(masks);
> return 0;
return ret;
> }
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