From: Megha Dey <megha.dey@xxxxxxxxx>
The dev-msi interrupts are to be allocated/freed only for custom devices,
not standard PCI-MSIX devices.
These interrupts are device-defined and they are distinct from the already
existing msi interrupts:
pci-msi: Standard PCI MSI/MSI-X setup format
platform-msi: Platform custom, but device-driver opaque MSI setup/control
arch-msi: fallback for devices not assigned to the generic PCI domain
dev-msi: device defined IRQ domain for ancillary devices. For e.g. DSA
portal devices use device specific IMS(Interrupt message store) interrupts.
dev-msi interrupts are represented by their own device-type. That means
dev->msi_list is never contended for different interrupt types. It
will either be all PCI-MSI or all device-defined.
Reviewed-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Megha Dey <megha.dey@xxxxxxxxx>
Signed-off-by: Dave Jiang <dave.jiang@xxxxxxxxx>
---
drivers/base/dev-msi.c | 23 +++++++++++++++++++++++
include/linux/msi.h | 4 ++++
2 files changed, 27 insertions(+)
diff --git a/drivers/base/dev-msi.c b/drivers/base/dev-msi.c
index 43d6ed3ba10f..4cc75bfd62da 100644
--- a/drivers/base/dev-msi.c
+++ b/drivers/base/dev-msi.c
@@ -145,3 +145,26 @@ struct irq_domain *create_remap_dev_msi_irq_domain(struct irq_domain *parent,
return domain;
}
#endif
+
+int dev_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
+ const struct platform_msi_ops *platform_ops)
+{
+ if (!dev->msi_domain) {
+ dev->msi_domain = dev_msi_default_domain;
+ } else if (dev->msi_domain != dev_msi_default_domain) {
+ dev_WARN_ONCE(dev, 1, "already registered to another irq domain?\n");
+ return -ENXIO;
+ }
+
+ return platform_msi_domain_alloc_irqs(dev, nvec, platform_ops);
+}
+EXPORT_SYMBOL_GPL(dev_msi_domain_alloc_irqs);
+
+void dev_msi_domain_free_irqs(struct device *dev)
+{
+ if (dev->msi_domain != dev_msi_default_domain)
+ dev_WARN_ONCE(dev, 1, "registered to incorrect irq domain?\n");
+
+ platform_msi_domain_free_irqs(dev);
+}
+EXPORT_SYMBOL_GPL(dev_msi_domain_free_irqs);
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 7098ba566bcd..9dde8a43a0f7 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -381,6 +381,10 @@ void platform_msi_mask_irq(struct irq_data *data);
int dev_msi_prepare(struct irq_domain *domain, struct device *dev,
int nvec, msi_alloc_info_t *arg);
+
+int dev_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
+ const struct platform_msi_ops *platform_ops);
+void dev_msi_domain_free_irqs(struct device *dev);
#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
