MSI functions can be for allocation and free can be directly
used by the device drivers without any wrapper provided by
bus drivers. So export these MSI functions.
Also, add a wrapper API to allocate MSIs providing only the
number of IRQ's rather than range for simpler driver usage.
Signed-off-by: Nipun Gupta <nipun.gupta@xxxxxxx>
---
Changes in v3->v4:
- No change
Changes in v3:
- New in this patch series. VFIO-CDX uses the new wrapper API
msi_domain_alloc_irqs and exported APIs. (This patch is moved
from CDX interrupt support to vfio-cdx patch, where these APIs
are used).
include/linux/msi.h | 6 ++++++
kernel/irq/msi.c | 2 ++
2 files changed, 8 insertions(+)
diff --git a/include/linux/msi.h b/include/linux/msi.h
index ddace8c34dcf..a9f77cbc8847 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -658,6 +658,12 @@ void platform_msi_device_domain_free(struct irq_domain *domain, unsigned int vir
void *platform_msi_get_host_data(struct irq_domain *domain);
bool msi_device_has_isolated_msi(struct device *dev);
+
+static inline int msi_domain_alloc_irqs(struct device *dev, unsigned int domid, int nirqs)
+{
+ return msi_domain_alloc_irqs_range(dev, domid, 0, nirqs - 1);
+}
+
#else /* CONFIG_GENERIC_MSI_IRQ */
static inline bool msi_device_has_isolated_msi(struct device *dev)
{
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 79b4a58ba9c3..4a324f683858 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -1404,6 +1404,7 @@ int msi_domain_alloc_irqs_range(struct device *dev, unsigned int domid,
msi_unlock_descs(dev);
return ret;
}
+EXPORT_SYMBOL_GPL(msi_domain_alloc_irqs_range);
/**
* msi_domain_alloc_irqs_all_locked - Allocate all interrupts from a MSI interrupt domain
@@ -1596,6 +1597,7 @@ void msi_domain_free_irqs_range(struct device *dev, unsigned int domid,
msi_domain_free_irqs_range_locked(dev, domid, first, last);
msi_unlock_descs(dev);
}
+EXPORT_SYMBOL_GPL(msi_domain_free_irqs_all);
/**
* msi_domain_free_irqs_all_locked - Free all interrupts from a MSI interrupt domain
--
2.34.1
