Commit 06fe8fd6 authored by Nipun Gupta's avatar Nipun Gupta Committed by Alex Williamson
Browse files

genirq/msi: Add MSI allocation helper and export MSI functions 



MSI functions 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 interrupts rather than range for simpler driver usage.

Signed-off-by: default avatarNipun Gupta <nipun.gupta@amd.com>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240423111021.1686144-1-nipun.gupta@amd.com


Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent 82b951e6

include/linux/msi.h

+6 −0
Original line number Diff line number Diff line
@@ -676,6 +676,12 @@ int platform_device_msi_init_and_alloc_irqs(struct device *dev, unsigned int nve 
void platform_device_msi_free_irqs_all(struct device *dev);



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)

{

kernel/irq/msi.c

+2 −0
Original line number Diff line number Diff line
@@ -1434,6 +1434,7 @@ 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
@@ -1680,6 +1681,7 @@ 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