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Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull irq fix from Ingo Molnar:
 "A fix for an MSI regression"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  genirq/msi: Make sure PCI MSIs are activated early
This commit is contained in:
Linus Torvalds 2016-08-12 12:41:51 -07:00
commit 25db69188e
3 changed files with 15 additions and 0 deletions
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2
drivers/pci/msi.c
View File

@ -1411,6 +1411,8 @@ struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
pci_msi_domain_update_chip_ops(info);
info->flags |= MSI_FLAG_ACTIVATE_EARLY;
domain = msi_create_irq_domain(fwnode, info, parent);
if (!domain)
return NULL;

2
include/linux/msi.h
View File

@ -270,6 +270,8 @@ enum {
MSI_FLAG_MULTI_PCI_MSI = (1 << 2),
/* Support PCI MSIX interrupts */
MSI_FLAG_PCI_MSIX = (1 << 3),
/* Needs early activate, required for PCI */
MSI_FLAG_ACTIVATE_EARLY = (1 << 4),
};
int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,

11
kernel/irq/msi.c
View File

@ -359,6 +359,17 @@ int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
else
dev_dbg(dev, "irq [%d-%d] for MSI\n",
virq, virq + desc->nvec_used - 1);
/*
* This flag is set by the PCI layer as we need to activate
* the MSI entries before the PCI layer enables MSI in the
* card. Otherwise the card latches a random msi message.
*/
if (info->flags & MSI_FLAG_ACTIVATE_EARLY) {
struct irq_data *irq_data;
irq_data = irq_domain_get_irq_data(domain, desc->irq);
irq_domain_activate_irq(irq_data);
}
}
return 0;